If you're looking for a more restful option, I recommend hanging out in the Signature Center on 42nd and 10th Ave. It's further away than, say, the Mariott, but it's a more welcoming environment. (recently, the Mariott has become increasingly unaccommodating to people hanging out in the lobby - not that they kick people out, but they got rid of some of the comfy chairs, and covered up the electrical outlets).
So yeah, for me - Signature Center is the way to go. Grab a book, grab a newspaper, play on your phone, or just sit and chat with your +1. Whatever you want - like I said, this is great if you're looking to rest and recharge.