From Muppet Wiki

Big Bird's Rambling River is the longest attraction at the Sesame Place amusement park. The ride opened to the public in 1990. The water ride is a 1,000-foot "lazy river", where visitors float in single innertubes through bubbling and swirling rapids, go under waterfalls and palm trees that dump water from the coconuts, and dodge geysers and fountains that spray water.