OMG DONT do it there. We went there because we have been to many Riu palaces before..riviera maya among others. When we got there we were shocked. The grounds are beautiful BUT, the service was awful, the food was crappy, the rooms had this awful smell and all the people we met seemed to have the same impression, The elevators kept breaking and we were on the 4th floor. I mean for the both of us these were all things we could deal with but when you fly people out u want to make sure that the service is excellent. Its a shame because the place is so pretty that on our last day we were already trying to convince ourselves that maybe were nuts? I mean this is only from my opinion everyone will ofcourse have their own...but I would never go back to the RIU in DR let alone have my wedding there.
I heard Paradisus was amazing though.
Good Luck.