Adventure is waiting for you at Avalanche Bay, Michigan's biggest and best indoor waterpark! There's action for everyone at Avalanche Bay - five waterslides, a lazy river, shallow kiddie pool, hot tubs, a cargo net crossing, activity pools, a huge arcade and Michigan's only indoor surf pool! And for the ultimate wet experience, when you hear the horn blow and the mountain rumble, look out as an 800 gallon water avalanche pours down on the explorers below from Splasherhorn Mountain! Discover wet fun for all ages at Avalanche Bay at Boyne Mountain. Where adventure lives!