On a recent trip to Cancun, Mexico we used Olympus Tours for our airport shuttle. They met us at the Cancun Airport and took us to our hotel. This was a great company to use.
We actually booked this when we booked our hotel stay. As we walked outside, they were standing their waiting for us holding a sign for their company making it easy to find them. They had us sign in and then got us onto a shuttle full of other people to take us to our hotel. We didn't have to wait for long.
They took us to our hotel and dropped us off. Their guy was great about helping us with our bags. Then they tell you when to meet up with one of their people at your hotel later that day to find out about the time they will pick you up to take you back to the airport. This is a meeting you will want to go to but be prepared that this is when they will try to sell you other excursions. This is great if you don't know what you are going to do on your trip, but we told them we already had our plans and they simply left us alone about it.
We were told when to meet Olympus Tours to head back to the airport. They picked us up right on time and got us to our destination. I would use them again if we were in the area. You can check out their website or book when you book your vacation.