Hi Courtney,
Well, yes, Williamsburg is all historical so it won't have the "poppin" nightlife you're looking for but there are a couple bars that are in the area.
Paul's Del, and the
Green Leaf. It will usually have college kids during the school year.
The drive to the beach is well worth it if you're looking for that nightlife that will match California. If you want to shave off about 15-20 mins on a trip (depending on how fast you drive, of course going the speed limit ;-) ) maybe check out Richmond.
As for exciting things to do, an amusement park is never a bad idea and Williamsburg is home to Busch Gardens. Or you can go to the largest water park on the east coast at Water Country USA.
If you're into the wineries, then check out the Williamsburg Winery. Hope this helps. Let us know how your trip went.