I've never been to Williamsburg but if I did, I don't think there are any breweries there I'd bother seeking out. I guess Williamsburg Alewerks is the one whose beer I have had. I'd drink their beer if it was free at a party, but I wouldn't make a detour to stop at their taphouse.
But yeah, up at 5am to chaperone 4th graders...you deserve a beer!