Many of the 140 opportunities involve woodland management, footpath repair, pond clearance and rhododendron clearance. This particular project involves the study of a dormant volcanic region threatened by urban sprawl.
Accommodation is relatively luxurious.
But if you want to help out in a Ghanaian hippo sanctuary, you'll sleep in mud huts and help to cook millet and yams. Around 6,500 volunteers each year enable disabled people to have a holiday and their carers to take a week off. Anyone over 16 can help and, although some of the duties can be demanding, it's possible to volunteer for a special-interest week and share craft and sports skills.