Ban Nam Chiao is a fishing and ecotourism village southwest of Trat, close enough for a half-day trip before or after the islands. Wooden houses, small bridges, mosques, temples, and boat channels sit close together, giving the village more texture than the average roadside stop.
Local tours may include boat rides, hat-making demonstrations, and simple meals. Go with modest expectations and you will probably enjoy it: the charm is in the everyday coastal life, not in a single big sight.