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Camp Ondessonk Testimonials Get ready to offer someone you love a summer packed with thrilling outdoor adventures. Camp Ondessonks summer camp program is the ticket to unforgettable experiences in the heart of the Shawnee National Forest in Illinois. Whether your loved one is a seasoned camper or venturing into the wilderness for the first time our camp offers something for everyone. Experience the Ultimate Adventure at Camp Ondessonks Summer Camp Program We present a week of nonstop excitement where each day is filled with epic activities like horseback riding through scenic trails conquering our challenging rockclimbing walls and paddling across pristine lakes.