Once the kids clear out, a brand-new indoor waterpark in Michigan hands its slides, wave pool, and not-so-lazy river over to adults only. Nobody under 21 gets through the door on these special nights.
The theme nights come with DJs, glowing lights, and even a full throwback to the ’90s. Some evenings add lip sync battles and dance contests, which honestly sounds like a dare for anyone who still knows every word to a boy band hit.
I love the idea of riding a six-person raft without a single kid begging for a rematch. I also like that the hot tub stretches outdoors, so you can soak in warm water while the cold night air does its thing overhead.
It’s a grown-up field trip with zero permission slips. So where is this place, and how do you get in?
A Bavarian-Themed Splash Zone Where Adults Finally Get A Turn
Bavarian Blast Waterpark sits inside the Bavarian Inn Lodge in Frankenmuth, Michigan. By day, it’s a family playground full of slides, splashes, and very excited kids.
On select evenings, though, the whole place flips the script. The lodge hosts Blast After Dark, a lineup of events open only to guests 21 and older.
That means the same slides your nephew rode at noon belong to you after dark. No floaties, no bargaining over one more turn, and no sticky snack wrappers drifting by.
The waterpark is part of a major expansion at the lodge, which has been described as an 80 million dollar project. It’s been billed as Michigan’s newest and largest indoor waterpark, so the scale here is no small splash pad.
Frankenmuth already pulls road-trippers with its Bavarian charm and storybook streets. Adding a grown-up waterpark night to that mix feels like a smart twist on a classic Michigan getaway.
Think of it as recess for people with mortgages. You still get the slides and waves, only now the crowd is your own age and the playlist is a lot better.
Blast After Dark Brings The Party Once Bedtime Hits
Glow sticks, a DJ, and an entire waterpark with no kids in sight. That’s the basic recipe behind Blast After Dark, and it works surprisingly well.
These events run on specific dates rather than every night, so planning ahead matters. The lodge posts upcoming themes and dates, and tickets may sell out for popular evenings.
Every Blast After Dark night is strictly 21 and over. Physical ID is part of the deal, so leave the expired license in the junk drawer and bring the real thing.
Past themes have included a Glowtopia Edition packed with glowing lights and high-energy music. Another night went full ’90s, which probably means neon swimwear made a comeback whether anyone asked for it or not.
DJs keep the energy going while guests slide, swim, and dance around the pools. Some themed nights also add lip sync battles and dance competitions for the brave and the slightly competitive.
You don’t need to be a party animal to enjoy it. Floating along while music bounces off the glass walls sounds pretty great, even for folks who prefer watching the dance-off from the lazy river.
Sixteen Slides And Not One Line Of Kindergartners
Sixteen water slides are waiting for you here. That number counts the new ones plus two older slides already inside the hotel.
The mix leans fun and varied rather than terrifying. You’ll find tube slides, a big family raft ride, and a racing mat slide that turns any couple into rivals.
The racing slide is the sneaky favorite. You lie flat on a mat, race the person next to you, and see your time at the bottom.
That little scoreboard changes everything. Suddenly a calm adult evening becomes a heated best-of-five match between best friends.
The tube slide has a couple of booster spots that push you along mid-ride. Expect a quick surprise or two, especially if you climb aboard thinking it’ll be a lazy cruise.
One fair heads-up is that some riders find the newer slides more playful than extreme. If you’re hunting for huge drops, the older tube slide on the far side of the hotel may suit your thrill level better.
Either way, the stairs count as cardio. Consider it a free workout bundled into your night out.
A Dragon Raft Ride Built For Your Whole Friend Group
Six seats, one big raft, and a dragon theme that fits Frankenmuth’s fairy-tale feel. The family raft ride ranks among the most talked-about attractions at Bavarian Blast Waterpark.
It takes some quick turns, so it moves faster than you might expect. Hold on tight and keep your back against the raft, because this one likes to toss you around a bit.
Here’s a practical tip worth remembering. Stay seated until staff pull the raft into the exit area, since jumping up early is a fast way to bonk your head.
The ride works best with a full crew. More weight in the raft tends to mean more speed, which makes a group of grown friends the ideal passengers.
Picture your book club or bowling league screaming down a twisting tunnel together. Honestly, that may be the best team-building exercise ever invented.
On an adults-only night, filling those six seats gets easier. No awkward splitting up from strangers, just your crew, one raft, and a whole lot of shrieking that nobody will hold against you later.
The Wave Pool With A Tuba-Playing Dragon
Only in Frankenmuth would a wave pool come with a dragon holding a tuba. Yes, really, and the dragon even squirts water out of the instrument.
The large indoor wave pool is one of the park’s most mentioned features. It’s a classic for a reason, since bobbing in waves never really gets old at any age.
During adults-only events, the wave pool turns into a social hub. You can float with friends, chat, and let the music carry across the water.
Nobody’s cannonballing next to you. Nobody’s asking you to watch them do a handstand for the eleventh time, either.
The wave pool isn’t the deepest ocean imitation you’ll ever find. Some swimmers find it a bit smaller than it looks, but it still delivers that easy, rolling fun.
Lifeguards keep watch here, which helps everyone relax. That matters even more at night, when the lights are low and the party is loud.
And that tuba-playing dragon? He’s a perfect mascot for a Bavarian town that loves its music and its whimsy in equal measure.
Fair Warning, The Lazy River Isn’t Very Lazy
Most lazy rivers barely move. The one at Bavarian Blast Waterpark has quick corners and a current that earned it the nickname not-so-lazy river.
That little burst of speed makes a big difference. Instead of drifting in slow motion, you get a gentle push that keeps things lively.
Floats are available at no extra charge, with single and double tubes ready to go. Grab a double, bring your favorite person, and let the current do all the work.
For adult nights, the river may be the easiest attraction to love. You can relax, talk, and watch the glowing lights without climbing a single stair.
The lazy river ranks among the most mentioned features at the park. It seems to please both the thrill crowd and the folks who just want to float with their eyes closed.
It’s a nice middle ground. Not too wild, not too sleepy, and just enough motion to keep your drink-free hands busy holding onto the tube handles.
Go a few laps. The corners sneak up on you every single time.
Michigan’s First Adults-Only Swim-Up Bar
A swim-up bar in Michigan once felt like a vacation fantasy. Bavarian Blast Waterpark made it real with what’s been called Michigan’s first adults-only swim-up bar.
State legislation signed by Governor Gretchen Whitmer in 2022 opened the door. That law allowed licensed hotels and waterparks to offer this kind of setup.
The bar connects to both indoor and outdoor pools. So you can stay toasty inside or swim out into the fresh air, even when Michigan weather gets bossy.
Large TVs hang nearby for game days. You won’t miss the Lions, Red Wings, Michigan State, or U of M while you’re soaking.
The water here stays warm too. State health rules require the bar pool to be kept at 95 degrees, so it feels more like a bath than a chilly plunge.
Food options and mocktail-style refreshments are part of the picture as well. It’s an easy spot to park yourself between slide runs.
During the day, it’s already reserved for grown-ups. After dark, the whole park catches up with that idea.
Soaking Outdoors While Snow Falls Is Pure Michigan Magic
Snowflakes landing on your head while you stay perfectly warm. That’s the indoor-outdoor hot tub experience at Bavarian Blast Waterpark.
The hot tub starts inside and leads outdoors. You can float right out into the open air, which feels downright luxurious in a Michigan winter.
Guests have used it even on bitterly cold days. Steam rolls off the water, the air bites a little, and the contrast feels oddly refreshing.
The warm pool and family spa are kept at 100 degrees under state health rules. That makes it the perfect thaw-out stop after a few laps of slides.
There’s also an adult-only hot tub area, which fits right into the grown-up theme. It gives you a calmer corner even during busy daytime hours.
In warmer months, the outdoor side can offer sunset views. Watching the sky change color from a hot tub sounds like a fine way to end a summer evening.
At night, the setting gets even better. Soft lights, cool air, and warm water add up to a mood no backyard pool can match.
Endless Summer Under A Glass Roof
February in Michigan rarely screams swimsuit season. Inside Bavarian Blast Waterpark, though, the temperature holds around a comfortable 80 degrees all year.
Glass walls and a glass roof let natural light pour in. The space feels open and airy, so you don’t get that dim, closed-in basement-pool vibe.
That design makes the park a true four-season escape. Rain, sleet, or a polar vortex won’t cancel your plans here.
It also makes adult nights feel special in any month. You could plan a summer date night or a winter friend reunion and get the same warm welcome.
Some guests feel a few attractions run slightly cool, while others rave about the water temperature. Water levels follow state rules, so the hot tub is always a cozy backup if you get chilly.
At night, the glass shows off a darker sky outside. Meanwhile, the inside glows with lights and music, creating a fun little bubble of summer.
Michiganders know how long winters can feel. A warm splash in January might be the best mood booster around.
Ropes Courses, Arcades, And Mini Bowling Round Out The Fun
Not every thrill at the lodge involves getting wet. The Bavarian Inn Lodge also features a towering ropes course that rises about three stories high.
It’s an obstacle course in the air, and it looks like a serious challenge. Grown-ups seem to enjoy it just as much as kids, maybe even more.
The arcade area is huge, with multiple rooms and plenty of game styles. Mini bowling stands out as a favorite, perfect for a quick round of friendly trash talk.
Cabanas are available for rent at the waterpark too. They give you a private home base with comfy seating between rides.
These extras make a night out feel fuller. You could slide for an hour, then dry off and battle your friends at skee-ball style games.
Arcade costs can add up quickly, so set a budget. Tokens have a funny way of disappearing faster than you planned.
Still, it’s nice to have options. Not everyone in your group needs to be a slide fanatic to have a great evening here.
Nachos, Pretzels, And A Schnitzel Worth The Walk
Soft pretzels belong in Frankenmuth, and the waterpark serves them. Nachos and pizza are also on hand, making snacking easy between splashes.
During Blast After Dark events, the food focus leans toward light snacks. That keeps things simple while the music and slides take center stage.
The lodge has more dining if you want a real meal. Ratskeller offers breakfast, pizza, and loaded fries, while Oma’s brings a sit-down dinner feel.
The Rattlesnake restaurant even has a few gluten-free options. That’s handy for anyone in your group with dietary needs.
Want something truly classic? Walk across the wooden covered bridge to the Bavarian Inn Restaurant for a hearty German meal.
The Jager Schnitzel there comes highly recommended, and portions are known for being generous. Go hungry, because leftovers are likely.
On busy days, waterpark food orders can take a while. Ordering a bit earlier than you plan to eat can help, and buzzing pagers let you roam while you wait.
Hours, Parking, And A Few Smart Moves Before You Go
You’ll find Bavarian Blast Waterpark at 700 Weiss St, Frankenmuth, MI 48734. It’s part of the Bavarian Inn Lodge, right along the river near the covered bridge.
Regular hours run 10 AM to 8 PM Sunday through Thursday. On Friday and Saturday, the park stays open until 9 PM.
Blast After Dark nights follow their own schedule. Dates and times can change, so check the lodge’s event calendar before you make plans.
Parking can stretch out on busy days. You may end up in the overflow lot across the street, so dropping your group at the door first can help.
Lockers are available for a daily fee. Towels are free to check out with a wristband, but return them before closing to dodge a charge.
Buying tickets ahead is a smart move. Sales and promotions sometimes pop up, which can make a big night out more affordable.
Pack a valid physical ID for adult events. Nobody wants to drive all the way to Frankenmuth only to be turned away at the door.
Why An Overnight Stay Makes This Night Even Better
Sliding until late and then driving home? That sounds exhausting, which is why staying the night makes so much sense here.
The Bavarian Inn Lodge has about 350 rooms and suites. Hotel guests get waterpark passes from arrival through departure, which stretches your fun across two days.
The lodge sometimes offers bundles that pair a room with Blast After Dark tickets. When available, those packages turn a single evening into a mini getaway.
Families have stayed here for generations, and that sense of tradition still shows. Some rooms keep a vintage feel, which fits Frankenmuth’s old-world personality nicely.
Waking up in town has its own perks too. You can stroll the shops, cross the covered bridge, and maybe grab another pretzel before heading home.
Is it a splurge? Maybe a little, but adult-only waterpark nights don’t come around every weekend in Michigan.
For a fun anniversary, a birthday with friends, or just a break from the usual routine, this place delivers something rare. Grab your swimsuit, your ID, and a friend who loves a good slide race.
