I have the same problem.
We're just going to rent cars at the airport anyway, as L&M seems reasonable since we're there for a week +.
The water parks, and dinners at the other resorts are so much easier to get to with a car.
I like to take a bunch of junk with me (towels, extra clothing, water bottles, extra sunscreen, googles, etc.) when I go to the water parks too. This is MUCH easier with a car.
I can also save a bunch picking up snacks, breakfast stuff, soda, milk, etc. with a car. I know you can get delivery, but that's from expensive store, and there is an additional fee.
Having a couple of cheap rentals for our group makes sense logistically.