Interlochen's Camp is amazing. I went two summers for musical theatre, and it's the most thrilling program. I know Barrett Foa was there as a camper when I was there too (though he was in the division above me, being older) They do really spectacular productions in both the musical and just regular theatre programs, and there is always something to do.
I remember my first day there, we listened to some welcome speech where someone said "If you don't fall right to sleep at night, you haven't gotten the most out of your day at Interlochen." I NEVER had trouble going to sleep. It's exhausting, but worth every second.
Also, they have amazing shows come through as part of their arts series. I saw the tour of JCS (with Ted Neely and Carl Anderson) and also saw Carol Channing and Joel Gray perform together. It was wickedly good. (God, that was a bad injoke!)
There's always room for pathos - and jazz hands.