Kanchanaburi is Kanchanaburi Province's capital city; a major tourist destination in Thailand and especially known for the River Kwai which runs right through it. Despite being touristy, it is laid back and has an abundance of accommodation and eateries.
The Bridge on the River Kwai is the main draw for many visitors to Kanchanaburi and you can walk it or take a train ride. The bridge was part of the infamous WWII Death Railway from Burma that was built by Allied POWs at the hands of the brutal Japanese. A sound and light show recreates yesteryear under the bridge every December.
Kanchanaburi town itself is not much to look at and houses a large shopping mall, hotels and a railway station. Thanon Saeng Chuto runs through the town to the bridge and is the main street. The most intriguing part of Kanchanaburi is around the river before you get to the bridge, where the bulk of the accommodation, cafés, bars and museum are at.
Farther afield and into the wilds of Kanchanaburi Province is a beautiful landscape and a collection of stunning national parks pockmarked with striking waterfalls. The most popular parks are Erawan National Park, Sai Yok National Park, and Si Nakharin National Park.
Kanchanaburi is directly accessible from Bangkok's Southern Bus Station or from Suvarnabhumi International Airport directly by taxi or hire car. You can also get to Kanchanaburi directly by train from Hualampong Station, which is close to the bus station although there are only a couple of services per day.