Koh Larn measures barely four kilometres across, yet it draws more day visitors than any other point in Chon Buri province. The island sits roughly seven kilometres off the Pattaya shoreline, close enough that its ridge is visible from Bali Hai Pier on a clear morning. Local boatmen have run the crossing since the fishing settlements of the mid-twentieth century, long before the catamarans arrived. The name translates loosely as coral island, and the reef gave the place its second identity. Tourists began arriving in numbers during the 1970s, when Pattaya's growth pushed weekend traffic outward in search of clearer water. Six main beaches ring the coast — Tawaen, Samae, Thien, Nual, Tong Lang and Ta Yai — each with its own character and its own approach angle for arriving vessels. Tawaen is the widest and the busiest. Nual, on the southern flank, stays quiet well past noon. Sak Island, or Koh Sak, lies just north, a fraction of the size and reachable in minutes. Its twin coves face opposite directions, which means one side is almost always sheltered. Together the two form the backbone of the three-island itinerary that shapes most pattaya tour package price listings on this page, usually completed with a stop at Koh Krok. What sustains the route is geography rather than construction. There is no monument here, no ticket gate, no conservation levy. Entrance is 0 THB, and Koh Larn itself is open around the clock — 00:00–23:59, every day of the week. The address on paper reads Koh Larn, Pattaya City, Bang Lamung District, Chon Buri, Thailand, though in practice the island is defined by its water rather than its streets. The modern fleet reflects that. Sailing catamarans crossed from charter work into scheduled day tours over the past two decades, offering shade decks and buffet service that the older longtail boats never could. Speedboats compress the same circuit into a faster loop. Evening yacht sailings, added more recently, trade snorkelling time for a westward horizon and a DJ deck. The Pattaya Islands are not a preserved landscape in the museum sense. Coral cover has thinned in places, mooring zones have been redrawn, and beach concessions come and go. But the crossing itself remains constant. Comparing a pattaya tour package price across catamaran, speedboat and sunset formats is really a question of pace: how many hours on the water, how much time ashore, and which of the six beaches you want underfoot.