The Gulf of Mexico meets Clearwater Harbor in a narrow channel where bottlenose dolphins hunt mullet schools every evening between April and October. Commercial sunset cruises began operating from Causeway Boulevard in 1987, when a single charter captain noticed that tourists gathering at Pier 60 for the nightly sunset festival would pay to watch the same spectacle from the water. By 2010, the harbor hosted eleven permitted operators; today that number stands at twenty-three, with vessels ranging from twelve-passenger pontoons to seventy-seat catamarans. The appeal is geographic. Clearwater Beach faces west across an open fetch of Gulf water, creating an unobstructed sightline to the horizon. Between 7:15 and 8:45 PM in summer — slightly earlier in winter — the sun descends through a layered atmosphere that refracts orange and magenta across the waterline. Dolphins follow baitfish into the shallows during this window, surfacing within thirty meters of slow-moving tour boats. The animals are wild, not fed or trained, and their presence depends on tidal flow and fish migration rather than schedule. Most Clearwater sunset boat tour operators depart from the marina at 25 Causeway Boulevard, a ten-slip facility adjacent to the Clearwater Marine Aquarium. Routes vary: some captains motor north past Sand Key and the Belleair shoreline before turning back; others head south toward the John's Pass channel, threading between barrier islands. A subset of tours includes a stop at a submerged sandbar one kilometer offshore, where passengers wade in waist-deep water during the final thirty minutes of daylight. Water depth at the sandbar ranges from 0.6 to 1.2 meters depending on tide. The evening light cruise — a narrated harbor tour without the sandbar stop — emerged as a distinct product category in 2019, appealing to visitors seeking a shorter, seated experience. These ninety-minute trips circle the Intracoastal Waterway, passing waterfront estates on Clearwater Island and the fixed spans of the Memorial Causeway Bridge. Diesel-powered tour boats yield to sailboats under the federal navigation priority system; captains time their routes to avoid crossing the main shipping lane during the six o'clock ferry departure from Clearwater Beach Marina.