We went for "the works". It was really fun to sit neck-deep in mud, rinse off and get a massage. I can't recommend it enough and would definitely go back.
The atmosphere is laid-back and fun, a refreshing break from some places that take themselves too seriously. We were about 15 minutes late, and the staff graciously accommodated us.
I would recommend asking when you check in about the tip. My friend and I did not enquire before we paid. There was not room to write in a tip on the charge, and we did not bring cash.