Chicago River Architecture Cruise, daytime, sunny weather, calm waters, Groupon deal, happy tourists, solo travelers, families with kids, seniors, holding cameras, binoculars, wearing sunglasses, sunhats, casual summer clothing, T-shirts, shorts, sneakers, boat deck seating, metal railings, life jackets, Chicago cityscape, Willis Tower, Tribune Tower, Navy Pier, riverbank buildings, modern skyscrapers, historic landmarks, ornate details, Art Deco style, Neoclassical style, Gothic style, panoramic view, wide-angle lens, vibrant colors, high contrast, clear blue sky.