If you aren't renting a car how are getting to Sea World, Universal, and Busch Gardens? Taking a tour, uber, taxi, or hiring a driver? I haven't been to any of those three recently but they were fun when I was there. What will be your main mode of transportation? Maybe after you are there a few days your other half might feel more comfortable driving.
I'm also unfamiliar with the place you are staying. Is a place in which you will have a kitchen? Are you planning to make meals? If so getting some groceries without a car might be tough. You might want to look into a grocery delivery service or having Amazon deliver some stuff. I have never done this but others might have.