Always remember what Cyndy Lauper once said... and for those of you out of touch with the 80's she said:
"Girls just wanna have fun"
The best thing you can do is show girls a good time. Just hanging out with your friends in public places making asses of yourselves and dicking around is clutch. Just don't be immature about it. My buddies and I have picked up girls in the ski lodge, Movie Theatres, Wal-Mart etc. Sheetz is a gold mine at like 1:30-2:00 AM when people are leaving parties and bars. Haha when we were 18 my buddies and I picked up 3, 21 year old chicks that just left a club at Sheetz and took them back to my friends place to drink more.
So many guys focus on "trying" to get laid. Don't try so hard. Every girl you meet isn't a potential lay. Have girls that are just your friend. When girls see you out with other girls, #1 they already assume that you're cool, and #2 if the girls you're with are good looking, they may be curious if thats your girlfriend and get slightly jealous. Not to mention girls that are just friends, may try to hook you up with their friends, and give you advice with other girls. And also that way you don't come across as too desperate. Desperate guys are such a turn off to girls. Kind of a catch 22 huh. But if you can get over that, you'll do well.
And when it comes down to actually the act of getting laid, in my experience, the best thing you can do is be honest with girls. Don't lie, and be sneaky and play girls out. If you're honest and tell them straight up, you're normally good. Because they have no reason to be mad at you then.
Just my 2 cents