We just got back from a 7-day on the Fantasy. Some additional info: I did not see any worth in going to the Rain Forest. If you wait until on-board to buy a day pass, the cost is $27/day. We had heard this was a good experience and signed up for the couples weekly rate. We are not experienced with steam rooms, and my wife has some mobility issues, and we are 65+ yrs old. The plaques in the showers are hard to read, they probably explain the differences between the shower areas - can't imagine taking my reading glasses into the showers. They seemed to vary from cold to warm - didn't do much for me. Warm couches were nice. The hot tubs: hard to get in and out of and the bottoms are stainless steel and slippery. Wife couldn't use them. To top it off, my wife got locked in one of the sections of the women's shower room and no one could hear her calling for assistance. I had no idea where she was and an attendant at the front desk checked the women's rooms and insisted she wasn't in there. Someone finally opened the door and she got out - after about 20 minutes. We told them that it wasn't something for us, that we were willing to pay for the one day we tried it, and wanted a refund of the difference. That's when they tried to charge us $27 each for the one day, but I told them I would not agree to that. Ended up paying them $16 ea plus gratuity. Didn't want to create a big issue about wife getting locked in.
The staff are pleasant, and my wife did get a massage there later - enjoyed it a lot, although it was pricey.