Be approachable! Smile, and talk to people, and if you're out on the prowl for a guy, don't bring more than one friend with you. Also, you want to look good, but if your look is especially fashion forward or avant garde, you might look great, but you won't look very approachable. A quiet girl who looks like she just stepped off the runway at a fashion show might catch a guy's interest, but even the most beautiful girls don't get asked out often if they don't seem approachable.