Stand occasionally and stretch. If you have important work to transact consider giving yourself a day of rest after arriving at your destination. Apply sunscreen to clean, dry skin 30 to 60 minutes before exposure to UV rays. If you anticipate swimming or excessive perspiration, use a water-resistant formula and reapply every one to three hours. But remember that reapplication does not extend the time of protection.
Many areas now frequented by tourists pose the risk of altitude illness.
You don't have to be at the peak of Everest for this to occur. In fact, symptoms may occur at any altitude above 7,000 feet. As we ascend, the partial pressure of oxygen in the air decreases, and hence we have less O2 for our red blood cells to deliver to the heart, brain and lungs. The body responds by increasing heart and respiratory rate and over time producing more red blood cells. However, not all changes are positive.