meditation retreats on the east coast?

[Natalie]

I live in the middle of a city. I need some peace and quiet in my life. I am able to take a few days to myself in May from work. I was interested in getting away by myself (by that I mean without anyone I know). I was looking into weekend/week long meditation retreats. I am not religious, but could deal with just a tiny tiny bit of it. I am interested in something that allows me to have the private quiet times I want while leaving me the option for group meditation/talk if needed. I live in Philadelphia, but will travel a bit if necessary. Thanks!!