Ok, so please also consider a woman's body language. If she's sitting on a bench and looking around, head up, just generally "open" looking then I'd say you're a go for trying to strike up a conversation. If she's hunched over, earbuds in/headphones on, reading/studying intently, etc then maybe pass her on by. You could still have success, but it's less likely.

Further, you see a cute woman in the library or union or cafeteria - be aware of your surroundings a bit. Are you blocking her in? A lot of women find that a lot of men don't like to take a No for an answer and if you pair that with a stance that blocks her in, it can feel threatening very quickly - obviously, not gonna get an enthusiatic yes if you do this, even unintentionally.

So, sounds lame, but what are you interests? Are you interested in some of the campus groups? Easy to meet people this way that doesn't feel so much like a cold approach. However, if you hit on every cute girl you meet in a group it will get around and you might get the creep or douche label. So pick something that you have a genuine interest in. Lots of people join these groups meet other people, romantically or platonically. If you can't tell (you probably can), it's been awhile since I was in college, but the casual sports group were a great way to meet people too - flag football kind of thing, or softball group.

Off campus - again, interests - bookstores, gyms, etc. Caveat about the gym - lots of ladies are just there to get their workout in and aren't open to being hit on, but lots also view it as automatically having an activity in common. You both care about your health and like to work out - can even go on a lifting date.

Anyway, just be a little thoughtful. Back off if she shoots you down, take it gracefully, try not to loom over her or block her in somewhere, etc. Good luck :)