Once you get to the volcano you must be prepared to walk up fairly steep, slick muddy steps. You are then thrown into a roughly 15 foot by 12 foot "crater" of mud. In our case we were literally head to foot across the entire pool of mud. Some very nice Columbian men rub mud all over you and give you a nice little massage. It was really a neat experience but not for you if you don't like mud or touching by strangers because there is a lot of both.
You then are taken back down the steps(slicker when you have mud all over) to a little stream/lake where some aggressive older Columbian women bathe you from head to toe. This was a both scary and hilarious experience. These women leave no crevice untouched; bathing suits were pulled down water splashed all over it was funny.
Good times, but not for everyone.