Just hanging out on the beach in Akumal would be a lot of fun. Great beach, snorkeling, food/drink. Just above Akumal is Half Moon Bay, with a great bar called La Buena Vida. Tulum is breathtaking, and Xel-Ha might be fun. It's an "eco-park" with tubing, snorkeling, hammock island, dolphin encounters, "cliff of courage", etc..
Have a great time. The Yucatan has soooo much to offer! You'll have a blast.
Have a great time. The Yucatan has soooo much to offer! You'll have a blast.