Are there lots of restrooms?

It would depend on wbat you mean by alot. Encourage you to grab a map of the gardens upon entry - there were restrooms in almost every building, that said, there are a limited amount of buildings in the gardens themselves.

Only in the buildings but none in the gardens so it depends where you find yourself

Enough.

I wouldn't say lots. It's a big place but your probably never farther than a five minute walk from one.

Yes, throughout the site and each building.

They are easy to find and we'll marked.

The restrooms are scattered around the premises its recommended to go as you enter but they are fairly scattered so if you frequently have to go yeah might be a bit of a walk depending where you are at.