Rubén's shop, a block back from the water between calles Isla Mujeres and Tulum, open every day from eight until seven.
Puerto Morelos is the quiet alternative to Playa and Cozumel: the same reef system, a village instead of a resort strip, and a boat ride of ten minutes rather than forty. Shallow coral gardens suit new divers; the Ojo de Agua and C-56 wreck sites give certified divers something with more to it.
They publish two phone numbers without saying which takes WhatsApp, so neither is listed here as one.