Switzerland's hiking trail network is considered one of the densest, most varied and over all, best posted one in the world. More than 65,000 km of mountain and hiking trails are marked: lined up, all of these trails would circle the globe about 1.5 times! Please remember that the weather can change very rapidly in the mountains. Even though the sky may be clear when you set out, you should still take along warm clothes or a fold up jacket for inclement weather. Always tell someone at your hotel where you are hiking.