Are there any places to sit down on in the museum?

There is one bench inside the museum and some along the way

Yes there are benches every so often and there is a bench just inside the door

Yes and they have a golf cart to take you if you need it

There are seats on the walk down none in the building.

Yes, there are.

There is one inside. I was there recently. There are some outside along the way to the site

Not inside but outside their are