Chicago River, architectural boat tour, daytime, clear blue sky, sun shining down, gentle water ripples, modern skyscrapers, Willis Tower, Tribune Tower, reflective glass windows, ornate stone carvings, Gothic-style bridges, urban cityscape, tourists on board, life jackets, captain's hat, binoculars, wooden boat deck, metal railings, Chicago Riverwalk, lush greenery, vibrant summer flowers, soft natural lighting.