We used Discover Mundo 2 weeks ago for a transfer from Cancun airport to the Playa Del Carmen Ferry going to Cozumel. I would highly recommend their service, the drivers were both very helpful and the vehicles had good air conditioning and were very nice. They made our airport transfers so easy. We got a bit lost trying to find the bus station where we were getting picked up on the way home and were a bit late, but our driver was waiting and was so gracious even though we had made him wait. Thanks Discovery Mundo, we will recommend you to all of our friends.