In my opinion, the best of the best are:
-Book stores (Intelligent women)
-World Market type stores (Cultured, worldly women)
-Target (I have the best luck here.. packed to the brim with hotties)
-Farmer's Market (More hippie gardening girls if anything, but lots of girls)
-The Mall (Shopping... need I say more?)
-University Campus (Even if you're done with schooling, go scope it out)
-The Park (At least half the time I find a lady here)
-Bars (If you aren't afraid of gyrating on the dance floor, you're golden)
That's the tip of the ice berg, just taking a bike ride anywhere can net you a wandering finey. Every place in your town and surrounding area has a certain average amount of women per hour wandering through... test the waters and find the place that's consistently worthwhile.