The 45-kilometer stretch between Cagliari and Villasimius holds more than a dozen named coves, yet until the 1990s no scheduled passenger service connected them by sea. Fishermen knew the route by heart — Cala Regina, Spiaggia del Riso, Cala Caterina — but tourists arriving at Cagliari's Molo Dogana faced a choice between rental cars and the inland highway. The Gulf of Angels, sheltered by Capo Carbonara to the southeast, had long been a working waterway rather than a leisure corridor. That changed when the Villasimius Marine Protected Area received formal designation in 1998, restricting motorized access to licensed operators and opening demand for guided excursions that could navigate the park's buffer zones legally. Today the Cagliari to Villasimius boat excursion operates as a hybrid product: part coastal sightseeing, part snorkeling shuttle, part tasting cruise. Operators depart from Molo Dogana between 09:00 and 10:00 to catch morning light on the limestone cliffs at Capo Boi and avoid the afternoon mistral that builds after 15:00. The route follows the contour of the Golfo di Cagliari southeast past Poetto Beach, then rounds the cape into open water where the seabed drops from 12 meters to 40 within a single boat length. Catamarans and rigid inflatables dominate the fleet; the former offer shade and stability for families, the latter speed and maneuverability for swim-stop itineraries that visit four or five coves in a six-hour window. The marine park itself covers 86 square kilometers and three protection tiers. Tour vessels hold permits for Zone B, which allows transit and anchorage but prohibits fishing. Snorkeling here reveals posidonia meadows — the seagrass beds that earned Mediterranean coastal waters UNESCO Intangible Heritage recognition in 2017 — alongside white sea bream, octopus, and seasonal grouper. Sardinia coastal cruise operators emphasize the park's role as a breeding ground for loggerhead turtles, though sightings remain opportunistic rather than guaranteed. Prosecco service and aperitivo platters distinguish the slower sailings, while speedboat variants prioritize additional coves over onboard dining. Villasimius itself functions as the turnaround point rather than a disembarkation port. Most tours anchor offshore for a swim, then return to Cagliari by 18:00. The asymmetry reflects logistics: Villasimius harbor handles fishing fleets and private yachts but lacks the passenger infrastructure for group arrivals. For travelers the effect is a closed loop — the journey becomes the destination, and the coast remains a viewed object rather than a traversed one. The model works because the coves reward repetition; even a second lap reveals detail missed in the first pass, and the light at 17:00 renders the cliffs a different color than the light at 10:00.