A must, no, you can take the internal bus system. Quicker and easier to get around, yup. Yes, you can rent them at the resort but they go pretty fast. We camped there in Oct., I called and rented ours about 2 days before the trip. My son and I could have easily gotten around without it by taking the internal bus, our campsite was near the boat dock. My honey, on the other hand, not so much. He like whipping around in it, he didn't go to the parks as much as us so he and the dog would play chauffeur and take us to the main bus stop and pick us up.