Definitely go. Take ferry from Playa Tortuga, you can purchase tixs from booth/kiosk located on the street when you get off the bus. They take US or Pesos. Take ferry over, but do not rent golf cart from boat vendors, you will pay 5 to 10 dollars more for a golf cart from 9 to 5. Get off ferry go to Gomar across the street from ferry and try to negiciate cart down to 40 or 42 dollars for the day. Free gas if you need a fill up. You do not need to purchase a map, ride around get a map from gold cart company and ride around the island. You cannot miss everything. We rode around the island twice and explored and found practically everything on our own. Island is not that big, had drinks, food and more drinks.
Best place is drive thru facility that faces Cancun side if island, you can pick up beers, sodas for your golf cart adventure.
Make sure you visit the cemetery on the per side of the island. Very interesting.