Do they have motorized carts for people who have heart issues

Yes

Yes but you should call ahead and get there when they open. First come first serve.

The cost to rent an ECV or electronic convience vehicle is $30 per day per vehicle. I hope this helps. A few can be reserved online a few days in advance. If that isn't possible then they are first come first serve. I hope this helps.

Yes they do but not a lot of them

They do but they are limited, I would call ahead.