I suggest you do a web search for alumni websites. They focus on people searching for college, HS, military, and camp alumni. For example, here's one of the more well-known alumni sites with which you could do a search for camp alumni:
FYI, I did a quick web search using keywords "Camp Wampanoag alumni ": I came with a few listings. This one is the first (unfortunately, an obit):
Peter G. Crone, 67
Professions: History teacher at the Waynflete School in Portland, Maine, Trinity Preparatory School in Orlando, Fla., Bancroft School in Worcester, Mass., and St. John's School in Houston, Texas; counselor and swimming director at Camp Wampanoag in Buzzards Bay, Mass
. and Camp Snipatuit in Rochester, Mass.
Degrees: Harvard College Class of 1962; Masters of Arts in Teaching from Stetson University.
Passions: Choral singing and amateur theater.
Death: July 3, 2006. From the Portland Press Herald/Maine Sunday Telegram.