Paleokastritsa's coastline is carved from Cretaceous limestone that fractured into sea caves over sixty million years of tectonic uplift and Ionian wave action. The result is a seven-kilometer ribbon of vertical cliffs, submerged grottoes, and pocket beaches accessible only by water. Where the modern resort village ends, the geology begins: arches hollowed to cathedral height, rock needles rising thirty meters from the seabed, and bays so sheltered that anchored boats sit motionless even when the open water runs rough. The tradition of coastal boat tours began in the 1960s when local fishermen offered passage to travelers curious about caves their nets avoided. By the 1980s, wooden caïques had been refitted with bench seating and outboard engines, and the route from Alipa Port to the Blue Caves became Corfu's most consistent maritime excursion. Today's fleet includes both traditional wooden hulls and fiberglass speedboats, but the itinerary remains tied to the same sequence of geological landmarks: Nausica Cave, named for the Homeric princess who met Odysseus on these shores; Paradise Beach, a crescent of white pebble reachable only by sea; and the twin sea arches near Limni Beach, their spans wide enough to pilot a boat through when the swell is low. The water clarity here is a function of the Ionian's low nutrient load and the absence of riverine sediment along Corfu's western flank. Visibility regularly exceeds twenty meters, and the limestone substrate reflects sunlight back through the water column, producing the turquoise gradient that photographers chase. The palette shifts with the hour: pale jade in morning light, cobalt at midday, and amber-tinted during the brief window before sunset when the cliffs glow apricot and the cave mouths darken to indigo. Most operators schedule departures between nine and eleven in the morning, when the sea is flattest and the caves still cool. Paleokastritsa boat tours anchor the visitor economy of this corner of Corfu, with five principal operators running overlapping routes and a dozen smaller outfits offering private charters. The beach itself is free to access, but the coastline's real architecture lies offshore, and a paleokastritsa beach boat tour remains the only practical way to see it. The experience is less about narration than navigation: threading through rock corridors, idling beneath overhangs where swallows nest, and stopping long enough in open water for passengers to swim above submerged limestone ledges that drop into the Ionian abyss.