Uttamanusorn Bridge or commonly known as Mon Bridge is the longest wooden bridge in Thailand and is the second longest in the world after the Mandalay's U Bein Bridge in Myanmar. Its total length is 850 metres. Locals walk across the bridge to make merit by giving food to monks, a daily routine. The best thing to do when you get there (except walking on it), is to prepare a picnic and get on the other small platform at the bottom, in the middle of the river. From there you have the best vantage point to see the sunset going down behind the bridge, while you're looking at the slow life of the local fishermen. It's probably the most beautiful sunset I've seen in all Thailand. Not far from the same region, you can also visit the sunken temple, Wat Wang Wiwekaram, Thong Pha Phum National Park and Sai Yok National Park. Again, do not take the road going to Khuean Srinagarindra National Park, it's very dangerous.