Hiking is a very enjoyable and healthy activity, however trails can pose many dangers for people who are not properly prepared.
Bring enough water and food
Make sure to bring lots of water on your hike. A lot of trails are longer than 3 hours with steep, uphill climbs and on a hot day, that may mean your body requires several liters of water. Also, contrary to what most believe, the running rivers, including those from glaciers, do not provide fresh water and you can become sick from various bacteria that breed in these waters.