We are planning a vacation to Cancun in December and would like to stay in the hotel that has the nicest, calmest, beach for swimming. We don't want any rough waters. If it might be rough that time of year we prefer to go to a carribean isle although Cancun would be more convienent. Any advice? Looking for a luxury hotel!!

The Fiesta American Grand Coral Beach is at the top of the Cancun hotel zone, which is shaped like a 7...it has very calm water, and is a 5 star (true AAA rating, not Apple!) hotel.
Check tripadvisor for reviews.