No. 3: Alaska
Weaknesses: Frigid weather, high cost of living, high crime rate
For nature and wildlife lovers, it doesn't get any better than Alaska. Its eight national parks make the Last Frontier a real gem for tourists. It also has one of the lowest tax rates in the country, thanks to the state's close relationship with the oil industry.
Retirees, however, should consider some of the downsides before deciding to relocate here.
The first is the cost of living. In 2014, apartment rentals averaged $1,280 per month in Anchorage, or 40 percent more than the national average, while homes were 62 percent higher than the national average.
Then there's the crime. Alaska has the fifth-worst rate of violent and property crimes in the country. Nowhere in the U.S. is rape more common than in Alaska, which has nearly 80 rapes per 100,000 people. That's nearly three times the national average.
The weather is also an issue. In Anchorage, summers are short and temperatures typically don't go over 60 degrees. Last summer was the third wettest on record for Alaska, with precipitation nearly 32 percent above average. Sunlight is also limited, especially in Juneau, which gets less sunlight than any other U.S. city.