If you're a soon-to-be-senior applying to college this fall, here's something to check. Do any of your chosen colleges ask, "Have you visited our campus?" on their applications? To find out, check the colleges' websites and see if you can still access last fall's applications. If they ask the visit question, it's one way that a college determines just how interested you really are.
Just because one of your chosen colleges asks the question doesn't mean you necessarily have to buy a plane ticket to visit (though if it's within driving distance, I'd strongly consider going). But it does mean that it's even more important to show that college that you really are interested and not just tossing an application in haphazardly. Here's a related post that might help.