Get a run in and enjoy the fall flora of Riverhead’s Indian Island County Park while supporting two important groups: the Long Island Greenbelt Trail Conference and the Riverhead High School Cross Country Team Booster Club. The Indian Island Trail 5-kilometer and 15k is 9 a.m. Saturday, Dec. 9 Check-in starts at 7 a.m. A three-person, 15k relay race also is an option. ADMISSION 5k is $35; 15k is $45; relay is $120 per three-person team