I only want to "tan" my legs? How do I achieve this?

Well a couple details about me, I have very light skin. I always wore jeans during the past couple of months, but kept my short sleeved shirts. So now the problem is that my legs are VERY white. My first idea was to tan my legs (wear long sleeve shirt and big hat) but now I'm wondering about the spray on tans? Is it in a can, are there any serious side effects? If anyone can give me the do's, don'ts, and how to's, then I'd be extremely grateful. I know nothing on it!