If you seek a retirement filled with picturesque peaks, rugged outdoor adventures and just enough city-style hustle and bustle to keep you piqued, mountain living might be just right for you. From the Siskiyous and Sierra out west to the Adirondacks and Appalachians in the east and the Rockies and Ozarks in between, you can choose as much activity or well-deserved rest and relaxation as you want.