Haulover Creek splits the peninsula on which Belize City is located in two. It was an ideal location for the British to colonize in 1638 because the creek gave access to inland logwood and mahogany resources. It has always been vulnerable to hurricanes, however, and that was the reason the British moved the capital to inland Belmopan in 1970. 
If you go to Tulum, it is the Maya ruins you must see. For modern Mexicans, the ancient Mayans have provided resources for recreation and tourism. Tulum provides a rare case of a Mayan city overlooking the sea. 
What could be more relaxing than a hammock on the beach. Here at El Mirador, near the southern end of Cozumel Island, a few hammocks let travelers try them out: to convince them they need one at home. The hammock seems to have originated with the fishnets of the Caribbean's native peoples, so it fits the cultural geography perfectly. 
Cozumel Island is nothing more than an uplifted limestone formation that has been subjected to the forces of weathering and erosion. The chemical weathering of limestone results in karst topography, with lots of underground caverns. That's what this sea arch started as before it was torn apart by Caribbean waves and tides. 
Avenida Quinta is the main drag of Playa del Carmen. The street has been turned over to pedestrians, tourists from all over the world. Lots of music drifts out onto the street from the restaurants and clubs. This one uses a mural as a backdrop: How much more Mexican can you get? 
Everybody needs sunglasses when they visit the tropics, even a plucked, bow-tied, jeans-wearing, color-coordinated chicken. What was giving the two dudes so much mirth, though, must have been an inside joke.