is this handicap accessible - can you use a scooter?

Yes, it is accessible. The displays are all outdoors on gravel. So long as your scooter is ok on gravel, you're good to go

I think it is closed to the public

Yes but like someone said it is outdoors

Yes

Yes but keep in mind it outdoors and on gravel

Yes ,handicap accessible ,outdoors dress accordingly

Yes Richard the Tour is handicapped accessible and a scooter would work