My husband and I decided to do a day trip to break up our stay and heard that Isla Mujeras is close and very accessible. Both are true however the ferry charges US$17 pp round trip but while there you will need to rent a golf cart to get around to see the sights. The golf carts are US$15 per hour or $45 for 3 hours. It only takes 1 hour to get around the Island itself but any portion thereafter wlll cost you another $15. The restaurants are pretty pricey so make sure you take enough currency with you. It did break the monotony however probably should have stayed in the resort where everything was already prepaid.