sex! Provided you aren't paying for the pleasure...
Also nature and scenary. There's nothing quite like wandering in teh countyside adn being blown away by the hills, sky, animals and all the amazing stuff you don't get in town. *goes into hippy mode*
Well according to Janet Jackson (to Loofer Van Dross - sic)....
You won't pay nothin' for this good lovin' It's for free
Debatable whether that's the best thing or not really. I would go with finding an abandoned suitcase full of unmarked �50 notes as being pretty darn good.
Actually I might go for the sun, (not the red top rag, but the fiery ball in the sky) I'd be hard pushed to find love or happiness wandering around in a black, barren wasteland, especially if it was too inhospitable for life to have ever existed.