Vacation in Wroclaw (Wrocław)

Hi
I´m going for work to Poland 3 days in Warsaw ( Protected content ) then to Krakaw ( Protected content ) for 4 days, after that I have 3 extra days ( Protected content ) , I have seen a lot of great things about Wroclaw can you make any suggestions on where to go what to see, what other sights to see?
Thanks