Mimik, where are you going to be? I grew up in the Philly suburbs (Plymouth Meeting/King of Prussia area) and may be able to help you with wine stores. I'm not current on restaurants though. I'm assuming that you'll have a car?
I had the opportunity to view the Barnes collection about 20 yrs ago and have to agree that it is an extremely impressive collection. If you have the opportunity to see it, I would definitely do it.