OC - Season 17, Episode 15 - The Tipping Point

Still in Mexico and still openly trying to push Heather out....
Still Open - Vidanta

They head into town where they split into two groups to go shopping and see a shaman.  After they have lunch at the resort where the shopping is. the lunch continues to be a pile on Heather to the point that she almost quits the show.

Still Open - Zak Ik

Still Open - Shaman Charlie

Still Open - Kin Toh

Later that night the tres amigas go out dancing and get wasted

Still Open - La Sirena