Travel is fun and exciting, but it's not if you get sick. You may think, "Not me. I won't get sick on my vacation." But for many people, that is what happens.
A vacation is supposed to be a time for relaxing. But very often it is not. "What can I do when I am a tourist?" This is what we should often think about. Usually, you may spend most days walking around some places of interest. Walking too much can be very tiring. It can cause your feet to hurt. And you may have a terrible headache after a few hours. It will weaken your body at last. If this is what you feel, you should take a rest. Don't ask your body to do too much. A tired body means a weak body. And a weak body can make you get ailing easily and see a doctor. Just sit down for a few hours in a nice place. In good weather, look for a quiet park bench (长凳).
Sleep is also important. If you want to keep healthy, you need enough sleep. You may have trouble sleeping at night when you travel. If that is true, don't be afraid to change rooms or hotels. You may not get enough sleep for another reason. In many cities the night life can be very exciting. Then you should plan to sleep for a few hours during the day. The extra (额外的) hours can make a big difference.
Finally, if you want to stay healthy, you must eat well. Your body needs fresh fruit and vegetables, and some milk. When you are in a new country, you may want to try new foods but you need to be careful about how much you eat. Lots of rich food is not very good for you.