Just and FYI, Cozumel is a great place for both divers and non-divers, but keep in mind that the US State Department has currently issued a travel advisory against taking the ferry from Playa Del Carmen to Cozumel (i.e., doing the "bag drag") but there are NO advisories against visiting Cozumel, see below.
I just mention this because some folks might prefer options for direct flight to Cozumel, especially when traveling with family members, but it is possible that the advisory against the ferry service may be lifted in the future.
U.S. government personnel are still prohibited from using ferry services between Playa del Carmen and Cozumel until further notice. U.S. citizens should not use ferry services operating between Playa del Carmen and Cozumel.
There are no restrictions on U.S. government employees for travel to other parts of Quintana Roo state, including tourist areas such as: Cancun, Cozumel, Tulum, and the Riviera Maya