If your travel plans include outdoor activities, take these steps to stay safe and healthy during your trip.

•    Stay alert to changing weather conditions and adjust your plans if conditions become unsafe.
•    Prepare for activities by wearing the right clothes and packing protective items, such as bug spray, sunscreen, and a basic first aid kit.
•    Consider learning basic first aid and CPR before travel. Bring a travel health kit with items appropriate for your activities.
•    Heat-related illness, such as heat stroke, can be deadly. Eat and drink regularly, wear loose and lightweight clothing, and limit physical activity during high temperatures.
o    If you are outside for many hours in heat, eat salty snacks and drink water to stay hydrated and replace salt lost through sweating.
•    Protect yourself from UV radiation: use sunscreen with an SPF of at least 15, wear protective clothing, and seek shade during the hottest time of day (10 a.m.–4 p.m.).
•    Be especially careful during summer months and at high elevation. Because sunlight reflects off snow, sand, and water, sun exposure may be increased during activities like skiing, swimming, and sailing.
•    Very cold temperatures can be dangerous. Dress in layers and cover heads, hands, and feet properly if you are visiting a cold location.
Stay safe around water
•    Swim only in designated swimming areas. Obey lifeguards and warning flags on beaches.
•    Practice safe boating—follow all boating safety laws, do not drink alcohol if driving a boat, and always wear a life jacket.
•    Do not dive into shallow water.
•    Do not swim in freshwater in developing areas or where sanitation is poor.
•    Avoid swallowing water when swimming. Untreated water can carry germs that make you sick.
•    To prevent infections, wear shoes on beaches where there may be animal waste.
Schistosomiasis, a parasitic infection that can be spread in fresh water. Avoid swimming in fresh, unchlorinated water, such as lakes, ponds, or rivers.

From cdc.gov