I loved taking mine for walks in Central Park! I also really loved walking mine in riverside park, right along the water- it is so beautiful and I have some amazing photos of them there.
www.amcny.org- Is this the ER vet rec you have? They are the absolute best!
My favorite store:
The New York Dog Shop, Puppia harness, dog clothing, toys, beds, bags, collars
I get emails from a yorkie meetup group- I would be happy to forward them to you over the next few months if anything comes through.
Basically you should just enjoy taking Thor with you as many places as possible- he will be welcomed in stores- Macy's, Bloomingdales, etc- there are many restuarants you can eat outside at with him.
Enjoy!