Robin:My husband and I are looking for the best snorkeling/beach day in Cozumel, I've looked at Nachi and Mr Sancho's but is the snorkeling good?
Snorkeling from beaches in the south is not good. Lots of sand in the beach equals lots of sand in the tidal zone. This means nowhere for the fish to hide, and lots of sand in the water.
We LOVED our day at Nachi Cocom. Perhaps you could sign up for the snorkeling excursion there and get the best of both worlds - plus the snorkel excursion will be less crowded.
Are the reef's within swimming distance?
No. You would have to swim close to 1/2 mile and would have no protection from the current that will sweep you rapidly north.
~ MattInSoCal
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