GREENWOOD LAKE-The Greenwood Lake Chamber of Commerce sponsored "Cruising on the Lake" event will be held again on Saturday, Aug. 21 (rain date Aug. 28). Due to the popularity of the event early reservations are recommended, said spokeswoman Ann Chaimowitz. Cruising on the Lake combines an early afternoon or evening cruise on beautiful Greenwood Lake with a dinner at one of the lake's participating restaurants. Cruise boats leave hourly between 3-7 p.m. from DeFeoís Marina, 672 Jersey Ave. Parking is free. Cruising on the Lake participants can choose to have dinner at one of four local restaurants: Breezy Point Inn, 620 Jersey Ave.; P & J Steak House, 40 Jersey Ave.; Rainbow Inn, 4 Court Ave., and Emerald Point Restaurant & Marina, 40 Sterling Road, all located in Greenwood Lake, N.Y. Lake cruises, on patio boats, will last approximately 35-45 minutes. Participants will be dropped off at the restaurant of their choice (those dining at P & J Steakhouse must drive to the restaurant after their cruise). Diners will be returned