We are two adults trying to find a lake resort that will bring back memories of summer camp. Any ideas?

there is actually a sleep away camp for grown ups in connecticut. i forget the name, but it is just like real camp, bunks and all.
if you want camp style, but not bunks, try woodloch pines in the poconos. they have a website.

Take a look at Mohonk Mountain House
in New Paltz, NY (Catskills)
Mohonk.com

i saw an ad for that "grown-up" sleepaway camp. it's called Club Getaway and is in Connecticut.
have fun

Call (705)635-2491: OLYMPIA SPORTS CAMP.
It's in Ontario, Canada near Algonquin Park about a 2.5 hour drive from Toronto .It's primarily a sports camp for kids but they also have adult camp. The location is spectacular! It is guaranteed to not only bring back memories but to create some very special and unforgettable new ones! Have fun!!

Thank you all for your suggestions. Now all I have to do is buy the marshmallows.