How do you properly vet locations where you are

A.) Approaching a large amount of women, 10+ in a session.

B.) Not wasting time walking around and looking to approach girls you find attractive.

Basically, I've been going to a Mall, but I'd find myself walking around 25 minutes going up and down, hunting for pussy, and there is a air, of "Oh shit I might be seen as the" pickup dude"

I live in Vancouver B.C. also, so I'm trying to find an efficient way of picking up a large volume of girls in an efficient manner, without having to walk in circles.