my wife and i just got married at the sun palace, it was a beautiful places, but adults only. the moon palace on the other hand was smuch bigger and much more family friendly, we only were there for a few hours, so i dont know all the details. but the people at these places treat you like royality. its crazy!!! so friendly and helpful.
also if you have kids check out xel ha, its about an hour away, but it was a great place, snorkeling, zip lines, swim with dolphins all kinds of fun stuff to do for the day.