The hikes described here begin at altitudes near 8,000 feet and some top out near 12,000 feet. Each hike is classified as “easy” to “difficult.” Only those in good physical condition should attempt the difficult hikes. Remember, when you go downhill you will have to climb back up when you return. Pace yourself, drink water and eat snacks to help prevent altitude sickness. Symptoms include headache, loss of appetite and weakness or drowsiness. If affected, descend quickly. If symptoms persist, seek medical aid.