We stayed at the Iberostar Select all-inclusive resort in Cancun, Mexico the week before Christmas. It was less than a two-hour flight from Orlando, which made it very easy. We booked one of the many taxi services (Cancun Airport Transportation), $85 roundtrip to the hotel.
Plenty to do at the resort, but mainly a lot of eating and drinking. The gym was adequate to get your heart rate going. The staff at the resort were very friendly and accommodating. We even took a thirty-minute ride on the red bus for a dollar to downtown Cancun for some authentic food and markets. Very safe. Better than paying for anything at the resort gift shop.
The buffet was excellent with many choices. I would recommend all the restaurants apart from the Japanese. All in all, a very relaxing stay with good friends.