You should absolutely do it.
Be extra careful at land border crossings.There is always someone looking to get as much money out of you for a service they provide.That includes the immigration officers.
I like waterfalls.So would recommend this.
http://www.tripadvisor.ca/Attraction_Review-g1641692-d1840276-Reviews-Erawan_Falls-Erawan_National_Park_Kanchanaburi_Province.html