Walk to a hottie, check her out and if no succes; look for the next girl to hit on. Continue till mission accomplished...
Make it look like you are on your way to something else and coincidentally run into her.
Don't follow same paths or make circles; it will look desperate.
"True. I was chick trailing"
"I was soo bored, I was chick trailing all night."
"And did you manage to finish the trail?"
"Yep, I made out with this really hot chick."