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Spend your last night on the mainland. Courtyard Marriott and Comfort Inn are close to the Cancun airport and provide free shuttles to the airport.
on the airport website it said there were shuttle vans that run 24/7 and they leave every 20 minutes, $25. The ADO is only 10 but only operates certain hours and not as often. So, extra $15 but probably worth it.There used to be a shared shuttle van that went south. See if that is running. It may cost double the price of the ADO bus.
Aeromexico has a great upgrade to premier class. You will get an email with an offer to bid in $us to upgrade. I bid $35 for Cancun to Mexico city and $25 Mex to Manzanillo. First leg was well worth it, 2nd was 1:15 so not really.