It's easy to get around on your own, but both Asian Trails (02/626-2000www.asiantrails.net) and Diethelm Travel (02/660-7000www.diethelmtravel.com), in Bangkok, organize trips to the floating markets as well as trekking trips, homestays, and bicycle tours.
The Tourism Authority of Thailand (TAT) (325 Saengchuto Rd., Kanchanaburi. 034/623691. www.tourismthailand.org) has several branches and is the main source for tourist information in the region.