The Coba Mayan ruins are conveniently located about one hour from the Riviera Maya and they are beside the ruins in Tulum the ruins with shortest distance from the Riviera Maya.
They are located on a very spread out area and just partly excavated yet, but they have the highest Tempel of all ruins in the Yucatán Peninsula.
Once you entered the ruins you are able to rent a bicycle and ride through the area. This is an option which I highly recommend since it is much faster than walking around. You are also able to hire tourguides. Near the entrance is the first impressive Tempel and the ballcourt.
On your way to the highest Tempel you will pass several other very interesting Tempels and ballcourts.
Riding a bicycle is fun and the area has much more shade than other ruins.