snej's post about San Francisco definitely makes me want to go back. I could actually imagine living there, despite the crazies, dirt, earthquakes, and insane (even by metro Boston standards) real estate prices. Other places I'd like to go:
For the food, and a different kind of culture. Dim sum of the gods !
To see my mother's side of the family. It would be great for my grandmother to see her great-grandchildren.
Haven't been in a while, and I'd like to see my brother's family. Unfortunately, they can't put us up because they live in a tiny house...