Ok, I was hanging out in san francisco tonight so I went by the boathouse. (Didn't have time to go in as I had to see star wars(Mini Review: DLP is good, George Lucas could never write dialog in the first place) I printed out directions from map quest and honestly had no problems following them, and nothing really needed to be added...
Bay area traffic wise, saturday shouldn't be a problem at all. There will be traffic, but it won't be that bad. If you're coming up from the peninusula, take 280 instead of 101 (you can always cut over on 380 to 280 right before s.f. if you insist on driving down the heart of silicon valley to ooh and ahh over the failed .com's)
From the east bay, I can attest that the directions that map blast will give you from market onwards are as good as you're going to get anywhere.
I realize this isn't as through as you were asking for, but it honestly shouldn't be that hard to find.
Matthew