Our local windmill and museum (right next door!) is one of the very best local museums in the whole of the UK. It is open 11am-5pm every Thursday, Sunday and Bank Holiday from Easter until late October. It is huge and is spread over many buildings. It goes on and on! When my grandchildren can't go they cry. For a few hours out, it is well worth a visit if you are in the area.
See http://www.burwellmuseum.org.uk/ .