No you don't have to stay. We went for a day and we didn't rent one but we could have.
No, you simply fill out a form and pay for the device you want. I do recommend that if you plan to visit during the weekend that you reserve what you'd like otherwise i suggest you go at the beginning of the week since its less crowded.The shop sells a little bit of everything too just in case you forget to bring something.
No. They have a website with prices.
No
No..Just call up there and make a reservation!
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