A friend that we stayed with in Cancun recommended that we visit these Mayan ruins for a memorable cultural experience. Located on the service road behind the hotel zone, it's a hidden gem. The cost of admission is fairly inexpensive. I think we paid about $3. We arrived about an half hour before closing and still had time to see all the ruins.
El Rey Ruins are near the hotels, so ask your concierge the easiest way to get there. The exact address is: Blvd Kukulcan Km 17, Zona Hotelera, Cancun.