Atlantic bottlenose dolphins maintain year-round residence along the Grand Strand's Intracoastal Waterway, with pods numbering fifteen to forty individuals tracked by the South Carolina Department of Natural Resources since 1994. The shallow estuarine corridor between Little River and Murrells Inlet sustains one of the eastern seaboard's densest populations, drawn by shrimp trawler activity and tidal creek ecosystems that flush nutrient-rich sediment twice daily. Commercial dolphin-watching operations began here in 1987, a decade after federal marine mammal protections ended captive display permits and redirected tourism toward observation-based encounters. The sunset dolphin cruise North Myrtle Beach market centers on Little River, a former fishing village whose sheltered docks accommodate vessels ranging from twenty-passenger speedboats to hundred-foot paddlewheel replicas. Departure schedules align with the golden hour, when westward sun angles illuminate dorsal fins breaking the waterline and silhouette marsh grasses along Waites Island's uninhabited shoreline. Captains navigate shallow draft channels at reduced speed, maintaining the federally mandated fifty-yard clearance while interpreting surface behavior: tail slaps signal feeding coordination, synchronized breathing indicates pod cohesion, and bow-riding demonstrates juvenile play patterns documented in peer-reviewed cetacean studies. The Intracoastal Waterway itself functions as a 3,000-mile engineered barge route completed in 1936, carving an inland passage from Boston to Brownsville through dredged rivers, natural sounds, and man-made canals. Its South Carolina segment threads between barrier islands and the mainland, passing historic rice plantations, active shrimping docks, and waterfront estates where wooden piers extend into spartina marshlands. Tidal amplitude reaches six feet during spring cycles, exposing oyster beds and fiddler crab colonies that attract wading birds and foraging dolphins alike. The waterway's brackish salinity gradient supports a transitional biome where freshwater runoff meets Atlantic currents, sustaining spotted seatrout, blue crab, and the baitfish schools that anchor the marine food web. Sunset dolphin cruise North Myrtle Beach tours operate daily from 4499 Mineola Avenue, with vessels departing hourly during peak season and narrated commentary covering species identification, coastal geology, and regional maritime history. The experience combines wildlife observation with environmental education, positioning dolphin encounters within broader estuarine conservation narratives that address habitat loss, water quality monitoring, and responsible ecotourism practices.