If you do need extra money, seasonal work like fruit picking and helping out in resorts are usually filled up pretty fast even before the season begins. If you turn up too late, these jobs will most likely be gone. In general, it is not very easy for foreigners to pick up casual work while in Europe. Understand that unemployment rates are high in many regions and because an EU citizen can simply work in any other EU country, the seasonal jobs are often filled the by people from elsewhere in Europe.
Seasoned travelers know that you are better off working in your own country for a few months in order to save up for a relaxing trip in Europe. You also probably receive better pay for casual work in your own country. Working in Spain or Croatia can sound very exotic and appealing but the reality is you're more likely to end up washing dishes for 10 hours a day in a hot kitchen just earning the equivalent of five dollars an hour.
If you are a Commonwealth citizen (Australian, South Africa, New Zealander, Canadian, or South African), you can take advantage of Britain's two-year working holiday visa to mix travel and work. It's available to anyone between the ages of 17 and 27. As a result, there are thousands of travelers working in restaurants, offices, farms and pubs around the country. Accommodation and meals are often part of the deal, so your cash payout might be lower than expected. However if you are interested in working in Britain, the first and you should do is sign up with one or more of the major recruitment companies that can place you in one of the many British vacancies.