White Peaks Ski

When 12-15 or 17-20 March
The cause Scope (campaigns for equality for people with disabilities)
The trip Ski or snowboard 24 Austrian peaks in 48 hours - as much vertical as skiing down Everest twice
Cost Entry fee, £100; minimum sponsorship, £1,400 (trip cost, £500)
Contact 0800 019 1200; scope.org.uk

Riding Mongolia

When 3-15 June or 23 September-2 October
The cause Any charity registered in the UK/Ireland
The trip Seven days of riding more than 100 miles through grassland and volcanic valleys to the fringes of the Gobi desert, visiting medieval Buddhist monasteries and nomad camps
Cost Registration fee, £395; minimum sponsorship, £2,575 (trip cost, £1,395)
Contact 020 8557 0000; charitychallenge.com

Masai Trek, Tanzania

When 17-26 June
The cause Breakthrough Breast Cancer
The trip 10-day hike across the Great Rift Valley, up to 18 miles a day through savannah, along an avenue of volcanic peaks, visiting remote Masai villages
Cost Registration fee, £395; minimum sponsorship, £2,575 (trip cost, £1,425)
Contact 020 7025 2422; breakthrough.org.uk

Sail to Fastnet

When 18-26 June
The cause Children in Crisis
The trip Sail in five 68ft oceangoing yachts across the Irish Sea, from Portsmouth to Kinsale and back. Open to novices and experienced sailors
Cost Registration fee, £150; minimum sponsorship, £2,000 (trip cost, £800)
Contact 020 8542 2000; childrenincrisis.org.uk

Brazil Rainforest Trek

When 9-18 September
The cause The British Heart Foundation
The trip Hike along the 18th-century Gold Trail, past waterfalls in the rainforest of the Serra da Bocaina National Park, followed by two nights in Rio
Cost Registration fee, £350; minimum sponsorship, £2,800 (trip cost, £1,259)
Contact 020 7487 7136; bhf.org.uk

Irish Bike Ride

When 15-22 September
The cause Greenpeace's campaign to prevent the extinction of dolphins and porpoises in UK waters
The trip 150 miles-plus around the Ring of Kerry and the Dingle peninsula
Cost Trip cost, paid by participants, of £289 includes ferry crossings Cork-Swansea, some meals, local coach transfers, and camp site fees. All funds raised are profit
Contact 0870 755 8519; bike-events.com

Women Cycle the Nile
When 30 October-6 November
The cause Professor Robert Winston's appeal to ensure women can have normal pregnancies and healthy babies
The trip Women-only (apart from Winston), 400km ride along the banks of the Nile, staying overnight on a river cruiser, visiting Pharaonic sites
Cost Registration fee, £230; minimum sponsorship, £2,500 (trip cost, £1,099)
Contact 0845 408 2698; actionforcharity.co.uk

Himalayan Trek

When 16-29 November or 25 November-8 December
The cause ActionAid
The trip Six-day mountain trek along the Uhl valley in India, past Hindu temples and isolated Buddhist monasteries; includes an audience with the Dalai Lama in Dharamsala; a trip to the Taj Mahal; and a visit to an ActionAid project helping street children in Delhi
Cost Registration fee, £300; minimum sponsorship, £2,850 (trip cost, £1,500)
Contact 01460 238047; actionaid.org.uk/adventures

· This is just a selection. For details of other trips, contact the charities direct, or the challenge organisers, which include: Across the Divide (01460 30456; acrossthedivide.com); Charity Challenge (020 8557 0000; charitychallenge.com); Classic Tours (020 7619 0066; classictours.co.uk); Community Action Treks (01228 564488; catreks.com); Discover Adventure (01722 718444; discoveradventure.com