NYC trip - beauty/spa/shopping recs?!

[MrsPotatohead]

I asked on ML about general advice (which I'm still happy to receive!), but I could use specific S&B advice. You guys had such good recs for Italy I thought I should ask again! I'll have time to myself since H will be at a conference for part of it so also coming up with girly things to do

- shopping: where are good areas to window shop/wander? any luck with consignment? I feel like that could be good there (I found some in Paris and it was awesome)

- spa: I was thinking about booking us a couples massage somewhere. I really like the places where the whole experience feels relaxing, as opposed to just popping in and out (I'm addicted to one here)

- beauty: depending on if we go see a show, I might want to go to a dry bar

thanks!