I think they only do the Cabana Massages on Castaway Cay -- all other services are done in the ship's spa. Check out www.castawayclub.com for more info as they have a spa section.
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!