Ladies and gentlemen, probably the best photography advice ever published: Just shoot it.
Against all odds - after all, their motto is 'DREAM IT. PLAN IT. DO IT.' - I came across this gem in National Geographic Adventure's recent blog entry called The Adventure Life With Steve Casimiro Adventure Photography: Stop And Shoot The Roses. Yes, it's probably one of the worst headlines ever, but please check this one out anyway - the article is short and to the point.
The bottom line is, your worst photos will be the ones you didn't take. So when you get out, be ready. You don't necessarily have to dream or plan anything, just keep moving forward and keep your eyes open. Sooner or later something interesting will happen, and then you have to act at once. If you fail to capture it right there, the moment will be gone forever. Life is not like the Groundhog Day.
The only advice I'd add is this: If you can't stop to take a photo, get a camera with a decent image stabilizer and shoot it (and blog it) anyway. Good luck!