El Presidente is the ONLY 5 star hotel on the island, for about the same price, you can go all inclusive at the Occidental Grand, very nice!!!!! We met some friends there in September, it's not our usual place but we were very impressed. they have a spa and a small gym, the grounds and buildings are beautiful and really well planned.
the food was really good at both the buffets and the reservation only restaurants. the buffets were different every day, not the same thing day in and day out.
2 pools, beach volleyball & ping-pong by the ocean side pool. roped off swimming area.
we were there the week of labor day, so there weren't a lot of children there that week.
draw backs are that it is pretty far south of town, a $17+ cab fare one way to town. you can rent a GEO Trekker for about $60 a day at the hotel, one of the best prices i've found.
there is not much to do at night, they did have a Mayan show one night when we were there. nothing to write home about. other than that there is a disco, it was not busy at all when we were there. there is internet service at the bar area in the main lobby. there's not much in the swim area to see, mostly a sea grass bottom, no coral heads and with the boat traffic, by mid-afternoon the visab wasn't that great.
We really liked the OG, but if it were my first time on Cozumel, and I could afford it, i'd do the El Presedente, it's closer to town and you really want to get some local flavor by going to town. let the kids see how the locals live and eat at some of the local restaurants. plus there's not much for shopping down south, just a couple of roadside stands.
rent a car at least one day and drive around the island, on the north side is a Mayan archeological site called San Gervasio, not the most impressive of the Mayan ruins compared to Chichen Itza, Tulum or Coba, but it's a pretty nice late period Mayan cultural center. lots of lizzards!! good jumping off place for the young mayanist.
We usually stay at the El Cid La Ceiba, it is currently going thru some renovations, always been our favorite, great location, nice beach, 2 pools, good food, some of the best snorkeling i've found on the island. usually not a lot of kids there though, it has always been kind of a "divers hotel", quiet and layed back.