No. Holbox has no official snorkeling reef, no marked snorkel trail and no reef you can reach from the beach. The only reef named in any Holbox tour listing is Los Cuevones, off Cabo Catoche, the north-east tip of the Yucatán peninsula. Cape Catoche Adventure and Nature Sightseeing Tour lists "Snorkeling at the Los Cuevones reef" among its inclusions, and Cabo Catoche Snorkel And Fishing snorkels the same water after its fishing session.
The island itself sits on a shallow, sandy shelf. The water off Holbox town, Punta Cocos and Punta Mosquito is shallow and often cloudy from stirred-up sand, with a pale sandy bottom and nothing growing on it. Tour desks and hotel boards that promise "snorkeling" mean one of two boat trips: Cabo Catoche, 40–45 minutes each way, or the whale-shark boat from 1 June to 15 September.

Holbox lies inside the Yum Balam Flora and Fauna Protection Area. There is no road to the cape and no public boat, so you arrive with a tour, and the tour decides where you get in the water. That is why choosing a tour is choosing your reef time.
So which tour? If you want reviews behind your choice, Cabo Catoche Snorkel And Fishing is rated 5.0 by 5 travellers and takes children from 5; its guide speaks Spanish. If you want English on board and a longer day with birdwatching on Río Santa Paula, Cape Catoche Adventure is bilingual and the only listing that names Los Cuevones, but it is new and has no reviews yet. Both cost about the same, $99–100 per person, and both include hotel pickup and gear.


