Only the concrete foundations of the 'Bridge on the River Kwai' remain. To reach the site, follow the signs from the main road, about 1km from Plantation Hotel in the direction of Adam’s Peak. Wannabe guides will attempt to show you the way but are not necessary. Apparently the actual railway carriages used in the movie now lie at the bottom of the river, after being sunk in an explosive conclusion. You’ll have to bring your own scuba gear if you want a look.
While they're in town, petrolheads will should definitely drop into the Classic Car Museum.