I am concluding after reading a bit on this forum that getting from Cozumel to Holbox is very time-consuming. Looks like I could rent a private plane at great expense, or ferry from Cozumel back to Playa del Carmen, transfer to Chiquile, then ferry to Holbox? Looking to snorkel with whale sharks, possibly over July 4th weekend, if the whale sharks decide to come to the party! Is there an easier way, maybe by boat or via Isla Mujeres? Of course, prefer locally-owned businesses, if possible. Thanks!