Whenever we go on a city break or visit a city on holiday, the first thing we do is a “free” walking tour. If you've never done one of these, they are technically free, but operate on a tip-based basis, with the idea that you pay what you think the tour is worth. Our attitude has been that we also consider what we could afford at the time - as broke students, we would usually put in about £5, but now we have a better income, we give more. Either way, they end up being an aff