Taken from an old port antonio forum post:
"6. If you want an out of body experience, there's always the mineral bath. About a 30-45 minute drive away, the Milk Mineral Bath will cure what ails you. It's 140F water coming straight off of the rock, and there will be "doctors" there who will massage you with special oils(another secret) and just bathe you in the water. And he's gonna wet your towel with it, so might wanna take a spare. He said that this would cure anything, and his special method would cleanse you completely. I left feeling like a new woman. If you go, ask the driver to take you in the back way where the locals go, otherwise you can go in through a hotel closeby, but the other way is more fun. :)"