re: Williamsburg, Va questions

One museum at Jamestown and then the 2 settlements the original is about a mile away but you have to drive there from the museum/replica settlement

You could do both but you'd need to hoof it through Colonial and not see much. You could spend the whole day at colonial Williamsburg and not see everything. But if you walked the length of D.O.G street and back and just browsed around for 2 hours then you could likely do all of Jamestown in 3-4 hours