Is there a coffee shop

I believe there is.

Yes!

There is one downstairs in rhe Visitor Center

There are a variety of coffee shops within easy walking distance. Independent ones and chains like Starbucks.

Not a coffee shop, but you can purchase a cup of coffee there

There was a small concession area the last time I was there in the summer of 2017

No

I don't recall one. A gift shop and tourist map shop are there along with being on the bus line.