If I drive northbound on 87 can I exit at New Baltimore service area?

It's a rest area only. Yes in either direction but you cannot get off i87

Yes you can, both sides use the same rest area.

Yes, it's a very easy on and off from both sides of the Thruway.

Yes. You can use it from either side of the NYS Thruway

Yes

Yes, u can use it from both ways

No I don't think you can

Agreed.

I'm not sure have you checked it out on map quest