You can often take CE's at a largely discounted rate as a student. I remember doing some ortho and endo CE's; ortho, I did the Powerprox ortho course (gave me a student discount), and I remember sitting in my school's endo CE course. I think it's more useful as a 3rd and 4th year since the courses have more context. I forgot what else I took, but it's not a bad idea. I think it also gives you a direction in terms of what you want to do in your own practice.
To reiterate what they are saying: Pass the NBDE (is there still a score?), it's not hard at all, but it is an annoying test if you have to retake it.