Hua Hin is the old royal seaside — the king's summer palace has stood on the beach here since the 1920s — and it photographs like it: a long, wide, gently shelving beach, horses walking the tideline, and a town that is quieter and more family-minded than Pattaya. Because the coast faces east, the sea is lit from the front at sunrise and the sun sets behind the land. That makes two good sessions: the first hour, with the light coming off the water, and the last two, when the beach is in open shade and nobody is squinting. At low tide the sand is wide and wet enough to hold a reflection, and the horses — a paid ride, arranged with their owners — give a frame that is entirely Hua Hin's own.
The best location is an hour south and works on its own schedule. In Phraya Nakhon cave, in Khao Sam Roi Yot National Park, a beam of light falls through a collapsed roof onto a royal pavilion between about 10:30 and 11:30, most reliably from December to March — after a steep climb of around half an hour from Laem Sala beach. Nearer town, Khao Takiab has its standing Buddha and its monkeys, the historic railway station is preserved beside the new elevated one, and Cha-am and Pranburi extend the coast north and south. Most visitors come by road from Bangkok, roughly three hours, which is why the session is best put on the second morning rather than the day of arrival. Families with young children usually take the late-afternoon beach session and leave the cave to the adults.