The freedom associated with having a car, to me anyway, far outweighs the cost of the rental. Great way to explore the Island and experience some unplanned side trips. If this is not your bag and you want to spend your time in one place (the beach) and rely on a cab for the infrequent trip somewhere then don't bother with a car. That's fine also but on my first (kinda) trip to SXM I would like to spend some time wandering around the Island, any Island, but that's just me...