if you are assigned a villa far from the main area (lobby, main pool, restaurant, boat dock to DTD), remember that most, if not all, of the buses stop at the main area (called "hospitality house") before heading out to a park. so just hop the first bus that comes by if you want to go to the main pool or catch a boat to DTD...
i tend to leave my car parked for the week when i stay at OKW but there is always a risk with buses that you'll have to wait...kinda depends on whether you're a "type a" or not...