I attended Flash and the City last year and had a great time. The conference is unique1with it's city track showing you the sights of of New York. If learning about the latest development in mobile programming and ActionScript coding gets a too much for you and you need a breath of fresh air you can go and visit the Statue of Liberty2 with fellow geeks.
1 In a good way of course!
2 Or the Museum of Sex if that's more your cup of tea.