This tiny port is where speedboats and traditional Thai longboats moor while visiting Khao Phing Kan. It’s one of more than 40 protected islands in Ao Phang-Nga Marine National Park. The islands’ distinctive shapes are formed as the limestone is weathered over time by wind, rain and waves. On the right: The minimalist architectural staircase at the Nai Harn resort. Dress, $5,020, and briefs, price upon request, Jil Sander. Shoes, $375, Stuart Weitzman. Earrings, price upon request, Altuzarra.