Both hotels are quite nice. The Royal Plaza is a lot more economical, I must say, but I loved the Hyatt. Mostly because they have a astounding fitness center that I used daily while staying there. Talk about a kick butt setting. All new Cybex weight equipment and top of the line treadmills and elliptical machines.
The Royal Plaza has a fairly small room by the pool with 5 cardio machines of various types and a small set of hand weights and some sort of universal machine. Blah.
I guess for half the price I can sit here and get fat.