I volunteered with GVI in Luaung Prabang in Laos in December 2012 -January 2013, teaching English to Buddhist novice monks at a temple, and to other students at a private school. I volunteered for only 2 weeks, and at the end my only regret was that I couldn't stay longer!
The town was beautiful, the Laos people I met and other volunteers were all great. The staff were amazing, there for you every step of the way, and always made you feel welcomed and valued.
The volunteering itself was really structured, which made it a lot less daunting and also meant you felt like you were actually helping, not just blundering your way through. It was challenging, but so very rewarding. I was capable of so much more than I expected, which was only due to the support I received from the staff and other volunteers.
Overall I could not recommend this experience highly enough!