Where: Spiti Valley/Kinnaur

When to go: June 8 to 23

How long: 10-17 days

How much: 34,000*

What to expect:

Mix work with pleasure! Travel through Spiti and spend five days assisting the local community in the construction of a Greenhouse enabling a local farmer or a monastery/nunnery to have access to green vegetables throughout the year. A trip that entails physical work, you will participate in the actual construction of a greenhouse. You will also visit some of the highest villages in the world, go on a high-altitude trek, visiting some ancient monasteries dating back to over a 1000 years and take a yak/horse safari and mountain bike if interested

Read more - http://www.spitiecosphere.com/eco_travel_volunteer_travel_1.htm