Williamsburg:
As far as sight seeing, you have to do
Colonial Williamsburg and
Jamestown. They really are National treasures.
My 2 favorite places to eat in Busch Gardens are the Das Festhaus in Octoberfest and the Trapper's Smokehouse in New France. The Das Festhaus is great German food and they have an entertaining show while you eat. Trapper's Smokehouse is a ribs, and roasted chicken kind of place.
Don't skip The Curse of Darkastle. It is very similar, but not quite as good a The Amazing Adventures of Spider-man. Also Alpengiest is an amazing B&M Suspended coaster. It is the largest one in the world. Loch Ness Monster is also a classic.
Celtic Fyre in Ireland is a very entertaining show. It is like Celtic Women meets Riverdance.
Richmond:
The Museum and White House of the Confederacy is the best Civil War Museum in the country.
There is also a great dining district in Richmond called Shockoe Slip and my favorite place to eat there is
The Tobacco Company.
Here is more info on Shockoe Slip.
As far as King's Dominion goes, there isn't any notable dining, but Outer Hanks isn't bad. And the other attractions I recommend are Flight of Fear and The Backlot Stunt Coaster. Dominator is also an entertaining B&M looper.