Hiya! I've just returned to the forum for the first time in years and you've given me something to reply to!
Are you just visiting? I'd try to rustle up a bike and get away from Grand Central for a day. Pick a downtown avenue and go until the road ends. Find a bridge and cross it! It will be awesome. Unless you're specifically trying to find and buy something, the city itself and riding around in traffic will be much more interesting than any shop. Have fun!