Chicago architecture, river cruise, promo code, sunny day, blue sky, calm waters, sailboat, cityscape, skyscrapers, modern buildings, historic landmarks, Willis Tower, Navy Pier, vibrant colors, detailed reflections on water, people taking photos, smiling tourists, casual clothing, sunglasses, summer hats, holding cameras, posing for photos, gentle breeze, soft lighting, panoramic view, 3/4 composition, shallow depth of field.