Those are some great ideas, PureLifeRN. I have just one minor issue to nitpick, though. I don't think you can audit classes and then use the credits for a degree, but I agree that taking them would be worthwhile.
I agree with taking ACLS regardless of what setting you want to work in. It's not that hard of a class, but I think it greatly contributes to ability to recognize and respond to several emergencies that everyone will likely encounter at one point or another in life, especially working as a nurse. Sure, you might not have all of the drugs and the defib handy, but the knowledge won't hurt you at all. I really enjoyed studying for and then taking that class, and I did end up finally getting a job that it applies to. Of course I'm a dork, but whatever. The only downside (other than the cost, anyway) is that after taking ACLS you'll want to throw stuff at your TV whenever one of those hospital or EMS shows is on.
If you do take ACLS, however, don't list it on you resume when applying for jobs for which it's not at all applicable. I think a lot of the folks in settings where it's not at all applicable (e.g. LTC, but I never applied there, so I can't be positive) see it and go "oh, he doesn't really want to be here."
If you graduated with an ADN look into starting work toward a BSN, esp. part time online through a respectable school. Don't sign up for too many hours or it'll make it impossible to start a FT job, though. I think this, combined with my previous experience as an LPN (and RN for the last 6 months, but not in a specialty that I wanted to remain in for long), put me on the radar of managers. It will keep your knowledge current, teach you more, and prepare you for eventual advancement. It also shows that you're interested in the career long term.
I think the number one most important thing that you can do is be your best at all times. Be gracious, kind, and confident but humble. Make a good impression on people, without acting phony. I ultimately got my new job because I interviewed with one manager and she recommended me to another at a sister hospital. Yes, the job I ended up getting was one that I hadn't even applied for (and I applied for a LOT of positions) and it's in one of my dream settings.
As far as classes at community colleges go, I don't know of any critical care or periop orientations offered around here. I do know, however, that many of the colleges have independent study type classes where you meet with an instructor (ideally one with good contacts that practices in the setting you want to enter) and design a course of study. It might be possible to arrange your own orientation, consisting perhaps of a didactic component (maybe ECCO if your interest is critical care, or the ENA online orientation if your interest is emergency nursing) followed by a clinical rotation in one of the hospitals the college has an arrangement with for clinicals. I can't be certain, but I'd wager that if you could get a hospital to agree to precept you after doing your own study program to prepare for that unit that you might make yourself a great opening for showing that you know your stuff and would be a good addition. Sure, it'd be expensive (the ENA course is $599 alone, for example), but I think it might be worth it to those of you who really, really want a job in a certain setting.
You might also look into volunteering with a fire department, esp. if you can get them to pay for EMT training if you commit to serving for a while. While it's not the same as working as a nurse you'll gain valuable skills and knowledge while serving your community. Plus it looks a lot better on the resume than "Sat around x1 yr watching reruns and infomercials, drinking beer, and crying because I couldn't find a job."
All joking aside, I wish all of the nurses who worked hard to get through school the best in finding jobs that they love.