Yes. But I would recommend you arrive ten minutes before the hour or half hour mark, because you are paying to play by The Hour or Two hour period.
Walking in is just fine. There are several computer stations to fill out the information for the waiver, and several cashiers setup to accept payment. Once that's done the kids are free to roam.
Yes walk in and fill out waiver.
Yes
Yes you can, there mightbe a wait however, or a shortage of space/options.
No
You can but I would suggest purchasing online.
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