Internship Hunting

Although I have recently met with a professor/adviser at college who lifted my spirits and created some optimism in my mind next to my future plans, I still manage to feel overwhelmed when I start hunting for internships. I printed out a list of 5 potential places that are looking for employment for the summer, but I am not really passionate about any of them at this time. Meanwhile, due to the help of a friend rather than any sort of direction from the supposed "Career Center" at school, I have now bookmarked a website with an extensive list of science related summer research opportunities; exciting at first until I realized all of the deadlines for summer ended somewhere between January and March.
I'm spending a good number of hours during this week off of classes editing my resume and finding contacts so that I may send my information and interests via email as soon as possible to companies/organizations directly in hopes that I can get my hands on something worthwhile...I just fear that summer is approaching too quickly and that I have once again waited too long. I'm trying to stay hopeful though - I'll do anything to avoid working a crappy part time, dead end job this summer. No more Applebees pleaseeeee.