I guess it all depends on your interests. We have been to Busch Gardens several times and one full day is good enough for us--we see and do everything we want in a day. We found the lines at Water Country to be extremely long, so you might want to add a second day there if you are big waterpark fans just so you can be sure to hit all the rides you want. As for Colonial Williamsburg, you probably can't do it all in a day if you want to go on tours, visit the various musuems, etc. However, if you plan carefully and just want to hit the highlights of CW, you can do this in a day. My first suggestion would be to stop by the visitor's center the night before your visit to see the movie which plays until 9pm or so. While you're there, get a copy of what's open and what's going on for the next day so you can choose what attractions you want to see. (My "must sees" would be the Capitol, Governor's Mansion and Raleigh Tavern, but yours may be different.) Finally, make sure you have tickets in hand and get there early--you can always wander around and get your bearings before the buildings open and you can wander around again in the evening when the buildings close.
A lot depends and you and your family's interests. I'd be happy with one day at BG, skip Water Country, 3 or 4 days for CW, and a day each for Jamestown (both sites) and Yorktown (both sites plus Riverwalk Landing). That may not suit you at all.
Since you're going to be here a week, think about purchasing the 7-4-1 pass, or the Historic Triangle pass (Colonial Williamsburg, Jamestown sites, Yorktown sites) plus a BG Discovery Ticket. The Historic Triangle ticket can be purchased at the CW Visitors Center. From the BG website about the Discovery Ticket, "Do what you want, when you want, as often as you want during your stay*. Discover Busch Gardens and Water Country USA and visit both or just one as many times as you’d like. It’s all up to you. * Valid for unlimited admission for 7 consecutive calendar days from date of first use." Then you can visit where you want when you want.
Being able to split up days is great. Try CW in the morning when it is not so hot, Water Country in the afternoon, and maybe an evening program back at CW in the evening, for example.
CW has three museums in one building now, fully air conditioned, and great for hot or stormy weather. The DeWitt Wallace Decorative Arts Museum, the Abby Aldrich Folk Art Museum, and the Publick Hospital are all in the Publick Hospital building. The exhibits are outstanding, and there are "highlights" tours which add to understanding and appreciating what you're seeing.
I hope this helps with your planning!
Thanks for the tips! I'm going to look into those passes you mentioned.
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