When deciding whether or not to rent a cabana, I suggest you realistically consider your family's interests. We've rented a cabana twice at HRH. The 1st time we only used it for a short while, & really didn't get our money's worth. Most people here love them, so I decided to try again.
Well, the 2nd time we rented wasn't much different. We rented the Stevie Wonder Cabana. When we arrived, another family was thoroughly enjoying our lounge chairs, but soon left. Guess they should have rented it instead of us.

As others have noted, you do receive water, sodas, & fruit. If you prefer all of one type of soda, they will substitute the others for you. Our son isn't by any means a water dog. We rarely can get him to go to the pool with us, even though we love it. He wants to spend most of the day in the parks, & we knew that going in. However, we were really looking forward to using our cabana & floats, during the evening movie. We planned to order dinner & drinks from the Beach Club, then relax & enjoy the movie. Unfortunately, the movie was cancelled due to weather. This also happened the 1st time we rented one. Just so you know, the weather doesn't really need to be that bad either. There was no rain for lightening in sight either time. There had been the usual late afternoon thunderstorm, but that happens pretty much daily. Living in FL, we know they come & go quickly.
Basically, we paid for the fruit, drinks, & about 30 minutes of use. Not a good idea for us. If your family is the type that loves spending the day lounging by the pool, definitely get one. Otherwise, you may want to reconsider. If it were just my DH & I, we would definitely get plenty of use out of it. In hindsight, I should have been realistic about how much time our son would actually want to spend by the pool, & not have booked it in the 1st place. Sometimes, it seems I never learn.
