The choir goes to San José, Costa Rica, to tour, where Miss Stevens tells Cartman that she plans on changing his views on third-world countries.
Upon arriving, Cartman immediately starts to make trouble, including yelling at Costa Ricans, directing everyone's attention to prostitutes, and commenting that San José "smells like ass."
The children get to meet the Costa Rican President and do a preview dance routine for some citizens of San José (with a pre-recorded song for the kids to lip-sync to), but Miss Stevens is dismayed by Kyle's lack of coordination.
Eventually, their tour guide is killed, eaten, and excreted by a coral snake, all surprisingly in the space of less than a minute, leaving Miss Stevens and the children on their own in the jungle.
Only moments later, he finds a friendly crew of white construction workers tearing down trees and tells them all about the group getting lost, though not before asking for food.
Back in San José, the concert is about an hour away from starting, and the President stalls for time by telling poorly-thought-out "Polak" jokes.
Just then, Cartman and the white construction workers arrive to destroy the village, kill the indigenous people, and save Miss Stevens and the children.
When the group escapes the forest, Miss Stevens and the children are so happy to leave the jungle that they change their tune: different lyrics are applied to the original song, which now rebukes the rainforest rather than praises it.
[2] Andy Patrizio of IGN wrote "Rainforest Shmainforest, is one of my favorites [of the third season]...Hearing [guest voice Jennifer Aniston] lose it at the end, with Stan's line "Now she gets it" was just a hoot.