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The city does not offer diving but you can go to Mahahual (140 km) to dive and snorkel with access to Mesoamerican Barrier Reef
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Underwater cenote in the Bay of Chetumal. The blue hole is the deepest sinkhole in the world with a measured depth of 420 meters, though there is some uncertainty about the accuracy of that measurement and the actual depth might be much deeper than thought. No divers or underwater probes have yet explored the bottom of the hole. Local dive shops can take divers there for a partial entry into the hole.
A Maya city which includes small temples, palaces, plazas, etc., about a kilometer from the bay shore. It's open 8am-5pm. Bring some water and a mosquito repellent. You can take a colectivo to Calderitas first and from there a taxi, or a taxi for the whole 16 km.
A fishing village with many seafood restaurants. If you are feeling adventurous, get in via the cheap and crowded communal ride that leaves next to the Mayan Culture Museum.
Largest Mayan settlement belonging to the region of the lakes.
Museo de la Cultura Maya
Get to know the importance of the Yucatan peninsula's Mayan civilization, see many sculptures and scaled down versions of temples and palaces. Learn about the Mayan principal economic activities and how they are carried out while discovering the Mayan numerical system. You can also learn and use the Mayan calendar.
Centro Cultural de las Bellas Artes
Located within the walls of the antique Belisario Dominguez school. Inside you'll find an open air theater, an art walk and the Chetumal museum. There's also a dance school, music school and the institute of culture.