First, I'm totally jealous of you being in the SF area!
Don't get discouraged after one week...it's a tough job market out there right now; however, employers are starting to hire again and you are PERFECTLY positioned having gotten a BA.
I have experience in hiring, past and present. Your time away from the job market shouldn't be an issue at all.
In this job market we get hundreds of applications for our open positions The majority don't meet the minimum qualifications, but for those who do, what usually sets them apart is an excellent cover letter. I'm glad somebody already raised this earlier. For some reason people always seem to think everything is obvious from their resume, but when you're reading lots of them, the person who connects the dots for you has a better chance of being considered more closely. For example, for a position the requires fluency in French, submitting a resume that shows you have a BA with a major in French is okay, but writing in your cover letter that you're suited the job because not only do you have that degree, you have experience speaking French in a business setting by an internship, blah,blah,blah or some personal experience or quality that may not be obvious from your resume (e.g., I lived in Senegal for three years, whatever...). You know, you might want to address your time away from the job market, stating that you spent the last X years raising your children, and while it was not an easy job, it required long hours, diligence, loyalty, patience....whatever might be hallmark qualities for the position you're seeking. I like it when people address this up front...that way I know what you've been up to and don't have to guess (okay,she was raising children, not just getting out of prison). It's something to consider.
Also extremely important is that the cover letter be well written and without grammatical or spelling errors. I can't tell you how many cover letters and resumes I've seen from highly educated and presumably intelligent individuals that read as if they were written by 10 year olds. If that's the best they can do before they get the job, when they're trying to impress us, well, they usually don't get more consideration unless there's some other exceptional reason to consider them.
Oh, and although you'll be applying for lots of positions, don't make the cardinal sin of mixing up letters or listing the wrong position in your cover letter. I find this funny, but most hiring officials don't.
These are just my random thoughts!
You'll probably have a job before you know it...then you'll have to ask about advice for how to fit in you workouts around your work schedule!
Best of luck and let us know how it goes.