We've always booked for the 9:00 time slot (i.e. right when you get off the boat).
For our first massage, it worked out great. After the massage, we spent the most of the rest of the day snorkelling (with OUT swim fins) and never felt sore.
My DW and friend did the early treatment this last time and thoroughly enjoyed themselves. Absolutely the best money they spent (and they spent alot) according to the two of them. They're still talking about it.
GET UP TO A $1000 SHIPBOARD CREDIT AND AN EXCLUSIVE GIFT!
If you make your Disney Cruise Line reservation with Dreams Unlimited Travel you’ll receive these incredible shipboard credits to spend on your cruise!