This year's Quadrathlon spring nature hike and trivia quiz will be held in conjunction with the annual Four Flags Ceremony. The Quadrathlon includes one such event each season of the year: in summer, a canoe/kayak ride; in the fall, a bike hike; and at Chapman State Park's Winterfest, a ski/snowshoe outing. Participants get a questionnaire at the beginning of the hike and find the answers along the way. The trivia quiz will be available at the Crescent Park Tree Walk from late Friday afternoon, May 23, and all day Saturday, May 24. Look for the Quadrathlon logo at each end of the trail. The event is sponsored by the Warren County Conservation District. Pictured is Jean Gomory, WCCD Watershed Specialist and founder of the event, preparing the Crescent Park program.