Chicago River, architectural landmarks, daytime, sunny, clear blue sky, Lake Michigan, sailboat, white sail, wooden deck, metal railing, group of tourists, mixed ages, casual clothing, sunglasses, smiling faces, holding cameras, standing, sitting, gesturing, guide in uniform, microphone, pointing at buildings, Willis Tower, Tribune Tower, Wrigley Building, Navy Pier, reflections on water, rippled waves, panoramic view, low-angle shot, dramatic composition, warm lighting.