The boat slips away from the wooden pier and the city exhales: a lattice of canals leading past teak houses, markets and a lacquer of morning smoke. On Day Two you stand at the edge of the Chao Phraya, the long-tail’s engine thrumming like a heartbeat, and you get the first real sense of how Thailand moves—by river, by road and by the patient choreography of ferry schedules. Over nine days the trip accelerates from Bangkok’s temple-strewn urban core to the cooler pines around Doi Suthep and then outward to the limestone and volcanic hulls of the Gulf islands that dare you into clear water and shallow coral.