We've never rented anything at Princess Cays since all we want to do is relax at a shady location next to the water.
As far a anything they provide free it's a chair or hammock and a free lunch which isn't to bad. Hamburgers, hot dogs, b-b-q chicken, chicken breast with fruits & salads. They also have a limited dessert items like brownies & cookies with ice tea available but no lemonade. I think they also have hot coffee although I've never looked for any.