I agree about with the people who say “no hotel lounge”.
A friend once set me up with someone he know from out of town. The first problem was that we could not agree on any restaurant at which to meet because she didn’t understand why there wasn’t one kashrut Vaad in NYC and therefore didn’t trust anybody’s hechsherim. So we agreed to meet at a particular hotel lobby motzi Shabat. I allowed plenty of time to get there because I wasn’t sure about traffic and I didn’t like being late to dates — I thought it was disrespectful.
So I get to the hotel a half hour early — no traffic at all — and who is there but the annual dinner of the Palestinian American Solidarity Fund! And here I am wandering around in my kippah waiting for my date, who ended up being an hour late!!! After less than two minutes it was clear we were completely incompatible. What a waste.
Some more possibilities:
Museums! Try the Center for Jewish History on 16th Street in Manhattan. A neat little museum with interesting exhibits.
The Bronx Zoo! If you go during Chol HaMoed you will see tons of frum people. (Even on Yom Tov but it is a long walk to the Bronx if you don’t already live here.)
The Bronx Botanical Garden! For those who prefer plants to animals ;). The Zoo and Botanical Gardens in the Bronx are MUCH larger than the similar facilities in the other boroughs and well worth the train ride. There is a little kosher cafe on Lydig Avenue in Pelham Parkway near both that could use your business.
The Empire State Building! The view from the top is great and you will have lots of time to converse with each other while in line. And there are plenty of kosher eateries nearby.
Ellis Island! Most American Jews have ancestors who came through there; it is well worth a trip.