For a visitor from Europe, Busch Gardens/W'burg may be a bit kitschy, given their living history as a comparison to ours. Note that prior to 4/7 the park operates on a limited schedule (open the 1st and 2nd, closed 3rd - 6th), and only from 10:00.
www.buschgardens.com
If you do decide to go, note that the weather is kind of iffy this time of year, with frequent rain.
Regarding hotels, this is one time I would pass on the miles and try to find a decent rate at one of the historic hotels in Williamsburg. Try
www.colonialwilliamsburg.com and branch out from there. Even if you elect to stay at the other hotels, I would recommend dinner at one of the restaurants that serves meals based on food that was available during the settlement period.
Good luck.