The closest airport is Cancún International Airport (CUN), which is about 45 minutes north of Playa del Carmen. From there, you can take a bus, a shuttle, rent a car or take a taxi.
Reserva de la Biósphera Sian Ka’an
Road 307 (Chetumal-Cancun) to Muyil Mayan ruins, then follow the jungle path to access a beach with boats.