We are planning to do an excursion in Cozumel and would like to add something for an hour or so before or after our excursion in Cozumel. We will be cruising Carnival Paradise. Is there anything interesting for kids within a 10-15 min walk? I don't recall which place Carnival docks. We aren't interested in shopping, but a pool, beach, sightseeing, or snorkeling could be fun. We aren't looking for anything spectacular, just a quick fun add-on right by the ship.