Trimom - my DD (now off in college) did CTY for three summers. She did one summer at Franklin and Marshall and two at Dickinson. She like F&M fine and enjoyed that summer, but she absolutely loved Dickinson and the slightly different culture there. The classes she took were: Cognitive Psychology, Neuroscience, and Ethics.
As an aside, if your child is interested in Neuroscience, it was much easier to get into it at Dickinson.
Here is a post, from a couple of years ago, of my reply to a similar topic:
http://giftedissues.davidsongifted....John_Hopkins_CTY_Program.html#Post241112Best of luck,
--S.F.