You might want to check out the Paradise Beach catamaran snorkel trip, see
www.paradise-beach-cozumel.net
BJC123 - hopefully your brother-in-law was on a tour outside the Marine Park when they fed the fish with tortillas... everyone please remember it is prohibited to feed the fish within the Marine Park... this applies to tour guides too. This is particularly important at the moment when the ecosystem is still recovering...
Still plenty of great snorkeling though!
Ian
www.wilmacozumel.com