Our family doesn't mind a long jolly, one of my favourites (that someone else did) was into the more restricted bits of Papua: Cannibals & Crampons (2001)
In 2001, two British ex army officers set out to climb the unscaled face of Mandela--a remote mountain rising 15,400 ft. above the jungles of New Guinea. This is the extraordinary story of their trek through some of the world's most unexplored terrain.