Thanks for your patience everyone. I'm using train timetables to figure out how early I need to get out of my meeting in Long Beach for a stop in Brooklyn (Bedouin Tent, Uniqulo, etc.) before returning to Penn Station for a 7:50 train back to Boston,with Junior's cheesecake and Middle Eastern takeout in hand.
I've got LIRR to Atlantic Terminal. If I leave Long Beach in time to get to Brooklyn by 4pm... do I have until 6:30 before I need to get to Penn Station? How tight would you cut it? Stopping also to see the High Line is out of the question, correct? If I did quick errands in Brooklyn from 4-5... could I see the High Line en route to Penn? Too much?