A couple books I would suggest:
McCarthy's Bar by Pete McCarthy: A half Irish half English (raised in England) guy decides to search for his roots by touring Ireland and visiting every McCarthy's Pub on the isle. Its pretty funny travel writing and contains travel by plane, bus, car, running and walking. There are encounters with crazy old women, bulls, tourists, hippies, hikers, drinkers, and pretty much everyone else you could imagine. Its a great read.
The Gold Coast by Nelson DeMille: A story about a WASP lawyer and his wife living in the old guest house of their family estate. They are both suffering the burdens of living such a life and its only complicated when a mob boss buys the next estate over. Its a book that people keep recomending to others - the word of mouth is amazing. I have told a number of people about and all of them really enjoyed it. Its a story about getting old, the ups and downs of marriage at the twenty year mark, part legal thriller part mob story, and part drama. Its also pretty damm funny. It is kind of a modern version of the Great Gatsby.
I would also second Touching the Void. The one comment I would make is that its pretty short and you would probably get hooked on it and finish it fast.
I just finished rereading Robinson Crusoe for the first time since I was a kid. Its a pretty good tale and easy enough reading once you get into it. Its good nighttime reading in the woods - depending on where you are you can feel some empathy for ole Robinson...
Lastly, if you like Science Fiction/Fantasy, check out Assassin's Apprentice by Robin Hobb. Its a great book, interesting plot, and fairly long so it should last an entire trip.
Enjoy your trip...