Dolphin Discovery can provide roundtrip transportation Cancun-Puerto Aventuras-Cancun with a cost of $15.00 USD per person. You must arrange this in advance.
If you have a car and want to drive yourself, take highway 307 which runs north/ south along the Mexican Caribbean coast. Leaving Cancun, you follow the signs for Playa del Carmen and Tulum. Puerto Aventuras is located between Xcaret and Xpu-Ha. The entrance is very well marked.
Once you enter the Puerto Aventuras complex, you will find signs leading you to the Dolphin Discovery facilities.