Pick a charity of your choice and head to the Thung Yai Naresuan Wildlife Sanctuary in western Thailand's Kanchanaburi Province.

Taking place in the spring of 2011 (10 March - 20 March) participants will spend six days trekking, rafting and kayaking on the River Kwai and riding elephants through the forests and mountains of the sanctuary.

They will be guided by the Karen people - local hill tribes who know the area better than anyone. Accommodation during the trek will be offered in the tribe's bamboo stilt houses. Registration costs £375 and the minimum sponsorship is set at £2,750 per person. Details: www.charitychallenge.com