No special ticket required and there are no steps, you should be fine to go!
Yes, is one level floor.
Yes it is all one floor and spaces out enough for wheelchair accessibility. No you do not need a special ticket.
I believe it is wheelchair assemble. I don't think you have to buy a special ticket for handicap admission.
You should be fine. It's pretty open spaces. The smallest spot is in the gift shop but even that should be fine too. No stairs Anywhere either.
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