Hiking trails in and around the Summit County area are among the best in Colorado! The immediate Keystone area includes numerous trails for all levels of hiking. In addition there are some awesome hikes within a day's drive. A great resource for hiking is The Summit Hiker by Mary Ellen Gilliland. This book is available in many Keystone stores.
A short and easy hike for beginners is Sapphire Point which offers a lovely lookout over Lake Dillon. The Sapphire Point trailhead is a quick drive from Keystone. Drive west on Hwy 6 watching for Swan Mountain Road on the left. Turn left onto Swan Mountain Road. Continue on Swan Mountain Road for about three miles. The trail head is on your right.
For just a bit more of a challenge try the Loveland Pass West Trail. The trailhead is located at the Summit of Loveland Pass. Drive east on Hwy 6 for approximately 9.8 miles. Park on either side of the road in the designated parking areas. The trailhead is on the west side of Hwy 6.
The ultimate challenge would be one of the famous Colorado 14ers. The closest to the Keystone area would be Grey's and Torrey's. This trail gives hikers a chance to bag two 14ers in one hike.
With all Colorado hikes please remember the following guidelines. Start close to sunrise, take more than enough water, wear sunscreen, wear layers, take rain gear, and watch the weather. Most important...have fun!