Park carefully . Thieves recognize and target tourist cars. Judge the safety of a lot by how it twinkles. Broken glass means thieves like this spot. Paying to park in a garage with an attendant can be a good investment. In many northern countries, train-ticket holders get discounts on bikes rented at the station. And in many cases you can rent a bike in one town and drop it at another for no extra charge. Pay with cash, not credit cards . While credit cards get you a good exchange rate, many places offering Europe's best deals — from craft shops to bed & breakfasts — accept only cash. When changing cash, avoid exchange bureaus that don't show both the buying and selling rate. By seeing both rates you can derive the profit margin — which should be within 5 percent. Places showing only the selling rate are hiding something... an obscene profit margin. Wear a money belt. You'll save money by not losing it. Thieves target Americans not because they'r