The Grand Palladium hotels are host to The Renova Spa. The spa just went through major renovations. They added and new gym and outdoor pool/whirlpool area exclusive to spa clients. All of the treatment rooms have their own outdoor, private showers......they are quite beautiful. Although I did not have any spa services, I was very impressed with the facility and the friendliness of the staff (this can make or break your spa experience all together)
You can also visit their website
.: Renova Spa :. Spas in Mexico, Dominican Republic
I have stayed at the Grand Palladium twice in the last 6 months, and highly recommend the resort.
Hope this helps.
Enjoy your birthday.....what better place to celebrate than beautiful DR!!!!!