Grammar vs. Vocabulary

Okay, so I'm having a little debate with myself over which is more important for me to focus on now: grammar or vocabulary. Not that anyone can do without both, but isn't vocabulary the bigger battle? the most worthwhile? Maybe the discussion goes back to knowing our weaknesses and strengths and knowing when to focus on problem areas or tap into our abilities for maximum effect. I was thinking I need a season of grammar study, but how to study it, I can't seem to work out.

On the other hand, there are lots of instances where I feel that if I only knew more words how much better I would express myself. Vocabulary is fairly easy: as I find places where I struggle to find the right words or in a certain content area, domestic, academic, etc, where I wish I could communicate, I can easily make up lists and lists of wods I want to know. Grammar is a little trickier. However, one method might prove effective--translation. When I am trying to translate English into Japanese is where I realize the grammatical possibilities there are and teh ares where I am lacking. I have some excellent grammar dictionaries, as I've mentioned before, but the trick is to get it into a part of my functional speech. I guess there is the same challenge with vocabulary. In our native language we know so much more than we use everyday; however, we don't seem to lose words that we don't use often, do we? What effective ways of studying grammar are out there? Which should get the bulk of my attention and what kinds of things can I do to improve my fluency? I'll send that out into the blogoshpere for study.