We just returned from a week on Isla Mujeres. I booked the private transfer from airport to the ferry and return. Driver was waiting for us when we walked out of airport and when we returned on the ferry. Anyone who doesn't book Discovery Mundo for their transfers from the Cancun airport is a fool. The price is right. There is no waiting around. Do not have to stop at multiple resorts before your drop off. The vehicles they drive are late model and very clean. I recommend Discovery Mundo to anyone who is visiting the Cancun area.