The rainforest is a room with heated chairs similiar to a sanua. It is co-ed. They have various scents in the air for therapy. It is a nice way to relax (or so I have heard).
The rasul is another spa treatment for 2 adults in a private set of rooms. Your main room is where you have the various muds, lotions, and washes. This is also where your towels and shower are located. The adjoining room is a VERY HOT sauna. You are locked in by the CM. No one can come in on your besides the CM's and they only come in. You can leave at anytime. Normally the CM will knock on the door when you have 15 minutes left to let you know how much time you have left. My DH loves this as much as I do. You can go in for relaxation or for the X rated version.