Chicago River, 90-minute architecture tour, daytime, sunny weather, clear blue sky, boat ride, slow pace, calm water reflection, cityscape background, modern skyscrapers, historic buildings, Willis Tower, Tribune Tower, Marina City, ornate bridges, urban landscape, detailed stonework, glass and steel structures, riverbank greenery, pedestrians walking, cyclists riding, seagulls flying, soft natural lighting, cinematic composition, wide-angle lens.