In brief . . . follow the Bangna-Trat road or motorway (Highway 7) out of Bangkok until you see Highway 344. Stay on the 344, looking out for police checkpoints as they like to stop drivers for no reason on this stretch of road. Join Highway 3 again near Klaeng and then, about 23km before Trat, turn left at the T-junction with 3156, signposted to Laem Ngop. 25 mins later you’ll be at the first of the ferry piers – ‘Ferry Koh Chang’, known as Ao Thammachat to most Thais