Gran Fiesta Tour is a boat ride in World Showcase - Mexico at Epcot. It's worth seeing on a time-permitting basis.
The interior of the Mexican pavilion's Mayan pyramid looks like a night-time scene in a Mexican marketplace. The interior takes inspiration from the Blue Bayou in Disneyland, including the boat ride that goes though the pavilion. Gran Fiesta Tour replaced the El Rio de Tiempo ride in 2007, and is now themed to Disney's Three Caballeros (Donald Duck, Jose Carioca, and Panchito), showing the sights and sounds of Mexico.
Walt Disney World