In the aquatic equivalent of a bobsled run, you set yourself up on a blue mat at the opening of a large tube, and at the end of a countdown, you and the seven other racers beside you fling yourselves into the chutes. You then slide through 300 feet of enclosed twisting and turning tubes—but that's not the best part. Things really get going when you enter a stretch that's nearly pitch-black except for a small band of light beside you. After what seems like both an eternity and an instant, you reach the final drop and slide the last few yards into the splashdown pool. If you can't see the end of the line, it's probably short—and it's time to head up. Eight lanes keep things moving along.
SeaWorld, Florida, 32821, United States