Marina de Albufeira sits at the mouth of a coastline where Atlantic bottlenose dolphins patrol year-round and sedimentary cliffs have collapsed into sea caves that daylight enters only by water. The Benagil Cave, six kilometres west, became the Algarve's most-photographed geological feature after its oculus roof appeared in travel publications in the early 2010s; tidal access and the chamber's 25-metre span make it reachable only by kayak, paddleboard, or small-draft vessel. Dolphin pods — common dolphins in spring and summer, bottlenose residents through autumn and winter — hunt sardine and mackerel schools along the same corridor, drawn by nutrient upwelling where the continental shelf drops away 15 kilometres offshore. Boat operators launched combined itineraries in response to demand for single-voyage access to both phenomena. Rigid inflatable boats and catamarans depart Marina de Albufeira between 09:00 and 16:00, threading the gap between coastal traffic and marine protected zones. Skippers hold commercial licenses and marine biology briefings; most trips include a geologist or naturalist on deck. The route follows the limestone escarpment west past Praia da Marinha and Praia da Albandeira, where wave erosion has carved arches and pillars into the cliff face. Dolphin sightings occur on approximately 75 percent of departures, concentrated in morning hours when pods feed closer to shore. The Benagil Cave's interior measures 30 metres at its widest point, with a sand floor exposed at low tide and vertical light shafts that illuminate the chamber walls in late morning. Boats anchor outside the entrance; passengers wade or swim the final five metres depending on swell. Return routes pass additional formations — the Gruta do Capitão, Arch of Albandeira, and collapsed sinkhole caves near Praia da Boneca — before re-entering the marina. The Algarve's karst topography, shaped by millennia of saltwater dissolution, continues to erode at a measured pace; geologists estimate the region's sea arches lose structural integrity at a rate of two to three centimetres per year, making current access finite. Dolphin and cave boat trip Albufeira departures operate under Portuguese maritime authority regulations, with passenger limits and exclusion zones enforced during calving season. The combination of cetacean observation and geological access in a single voyage has become the marina's signature offering, drawing visitors seeking both marine life encounters and coastal formation study within a half-day window.