Suit up for a day of splashing! Avalanche Bay Waterpark at Boyne Mountain Resort is Michigan’s favorite indoor waterpark — 88,000 square feet of rides, slides, and pure fun. Drop into the Big Couloir’s launch capsule and blast through a 360° super loop, race your crew down the four-lane Downhill Mat Racer, or catch endless waves on the Rip Zone surf simulator. Northern Michigan’s ultimate weatherproof playground is open year-round and always 84° — no matter what’s happening outside.