I have to third the copies of the passport. I always carry a photocopy and give one to my parents, just in case.

I always take a notebook for sketches, journaling. I filled up a whole book the year I was in Spain and had so much fun reading through it again a few months back. I only wish I had written more.

For clothes, a fleece vest, windbreaker and some long johns. I don't like being cold, and hate having wind rip right through my clothes. Lots of socks, and band aids for blistered feet..