Take one at your local community college. MCC has several each semester at almost all its campuses around the valley.
What to expect: a two day "refresher" which includes a final exam. if you cannot pass the final you cannot pass the refresher and get credit. however, if you cannot pass their final - which is insanely easy - you should never touch a patient again. why is the final so easy you ask? well, they read you the questions and correct answers before you take the thing, and the questions are also just plain ridiculously easy.
I am personally partial to the refresher's taught at PVCC by Mike Adleman or Chris Murphy because they seem to make the time pass quickly.