Chicago River, architectural boat tour, daytime, sunny sky, clear blue water, Groupon coupon, group of tourists, smiling faces, sunglasses, casual clothing, life jackets, boat captain, steering wheel, city skyscrapers, Willis Tower, Tribune Tower, Wrigley Building, modern glass buildings, historic landmarks, riverbank, walking path, trees, urban landscape, 3/4 composition, soft natural light, panoramic view.