Williamsburg Inn. They are pretty horrible to work with (understaffed, incompetant) but beautiful grounds. We did the ceremony in the fountain garden, cocktails on the terrace and around the garden and set up a tent to do dinner/dancing in the oval garden behind the brick house.
Absolutely look at Eagles Nest in Charles City. Beautiful location overlooking the Chickahominy River AND a pleasure to work with - flexible with vendors, schedules and super friendly caretaker. http://www.eaglesnestevents.com/