Eugene, Oregon
Livability index: 59
Population: 358,300
Median housing price: $222,000
Sunny days per year: 155
Nestled in the lush Willamette Valley, Eugene has "carefully cultivated its image as an outdoor-lover's paradise," according to AARP The Magazine. Its high concentration of nature mavens — including the area's college students and retirees — frequent farmers markets, vineyards, hiking and biking trails, museums, and galleries.