In reply to Kimono:
Ok, some good suggestions there folks. As regards safety, I actually live in the Dominican Republic so am pretty good at surviving poor Latin countries.
How about packing tips? I like to travel light so am hoping to bring as little as poss and not have a huge rucksack on my back. Hot weather clothing, a fleece, some trekking sandals and a few odds and sods. How did others fare with this?