Why not hike the length of the Amazon River like this guy is doing:
“Ed Stafford is walking the length of the Amazon river in South America from the source to the sea. He has been walking for: 521 days
He started on 2nd April 2008 and is expecting to finish in May 2010. No-one has ever done what he is attempting....”
Or spend 21 hours in a tent on the summit of Everest like this guy did.