Here are your choices for transportation in Puerto Morelos and the Riviera Maya.
Renting a car will give you total mobility. You'll be free to drive into Cancun or visit many of the cenotes and Mayan ruins in the area. Most of the big name car rental companies operate in Cancun. Just reserve your rental in advance and pick it up after your arrival at the airport. Click on this link to reserve your car thru Expedia. Bear in mind that insurance is not included in these quotes and will be added when you pick the car up.Website
Taxis are abundant in Puerto Morelos as well as Cancun, Playa del Carmen and Tulum. Simply hail a cab and head off to where you want to go. There is a taxi stand off the Town Square in Puerto Morelos and a taxi stand just off Highway 307 on the road into Puerto Morelos. You can get the phone number of the driver and call him from your home or hotel when you need a ride. You can also get the phone number for the taxi stand and call when you need a ride.
The colectivo is a small bus/van that travels a circular route thru Puerto Morelos and the colonia on the highway. You can jump on the colectivo to go anywhere in town or to the ADO bus stop on Highway 307. From the bus stop on Highway 307 you can take an ADO bus into Cancun and transfer to anywhere you want to go in Mexico.
Puerto Morelos is easy to get around on foot. If you plan to spend most of your time right here in town, just walk. It will be good for you and good for our environment.