I went to a nerd camp the summer after seventh grade:
http://en.wikipedia.org/wiki/Center_for_Talented_Youth

I studied math, and it was a great experience. I was surrounded by really smart people, and was very humbled. I realized (not for the first time) that there are many people out there that are much, much smarter than the likes of me!

Did you ever go to a nerd camp growing up?