The best way to reach the Cenote is by foot. There is no need to find transportation to Cenote Zaci as it is a 5 minute walk from the downtown Valladolid.
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.