Join a group of guys as they go Windsurfing in some of Alaska's toughest waters. Alaska's Turnagain Arm experiences the second highest tides in the world, often up to a 38-foot change in water level. Bore tides, a rare natural phenomena when the front of an incoming tide is a moving wall of water from 3 to 5 feet high, can be witness during extremely low tides in Turnagain Arm.