Well you are right tho! Sun makes you happy - it releases endorphins (hence the tanning bed addiction you hear about) and sunlight increases your metabolism and increases your body's ability to maintain itself properly (use its stored vitamins/minerals to keep you healthy) etc....so no wonder people who stay locked up inside all day are all depressed and moody and people who get outside are all perky and energetic. It's a natural, healthy drug.
Oops, guess I got on a soapbox too!
I get way too much sun. I'm sure you can't tell.