For greenery seekers: Tucson, AZ

For all its desert heat, Tucson is a wonderland of plants. It's home to the world's largest regional cactus and succulent society. Tucson Botanical Gardens (pictured) holds a dazzling array of succulents and other Southwestern plants. Tohono Chul Park located 10 worth-it miles north of downtown, is a 47-acre botanical oasis. And in springtime, desert wildflowers amaze.

More: One perfect day at the Tucson Botanical Garden