Hi, I am staying at their sister hotel The Royal Playa del Carmen. There is loads of information on the Cancun forum on Trip Advisor. I did ask on here first, but there were no replies.
I know you don't need any reservations for the restaurants (well maybe Chef's plate), you just turn up and if there is a wait, they give you a walkie talkie, you go for a drink and they contact you when your table is ready.
You can use the facilities of the sister hotels - the Gran Caribe which is next door to the Royal, or travel down to Playa and use the Royal Playa hotel for the day..
It has amazing reviews (both of them). We are going in Sept, when are you going? Denny