5. San Diego, CA Average Temp (High, Low): 71, 57 Per capita Income: $30,955 Average Rent: $1324 Population: 3,177,063 Median Age: 33.6 If you’re wondering where in the world Carmen is, we can’t promise you she’s in San Diego. However, we can inform you that this diverse city houses three of the top zoos and is ranked the third best city for quality (and quantity) of happy hours. San Diego has some solid nightlife establishments, especially in the Gaslamp Quarter — 16.5 blocks of happy hours galore, plus tons of clubs and live music venues. To pass the daytime hours, San Diego features 70 miles of beaches (mind you, it’s the seventh largest city in the U.S.), and it’s got some killer street art. Hungry after all that sightseeing? Snag a slice of the best pizza in the U.S., but don’t think about throwing that paper plate on the street: Nearly two thirds of the city’s residents are recycling-conscious.