Simon Calder has more great advice for taking care of yourself while travelling.
1. When sightseeing, don't lose focus
Pickpockets, bag-snatchers and scam artists are as fond of busy tourist attractions as they are of transport terminals. Rome, Florence, Prague, Barcelona and Seville are prime crime territory. Again, be aware when crowds form around you, whether of young children or large men. If anything unusual happens - eg, a woman claiming to have found a wedding ring, or a man who "finds" a wallet and seeks your help - be immediately suspicious. This usually marks the beginning of an elaborate and often expensive scam.
2. Stay on the right side of the law
Breaking the law abroad is easier than you may think. Be sure to respect local customs and cultural sensitivities. Drunkenness that may be seen as good-natured here could earn you a stay in a cell in Poland - and you'll be presented with a bill the next morning for your "care".