Running out of ideas for ways to entertain the kids for the remainder of the long school holidays? Fear not, the Cambridge Independent has scoured the horizon for all things fun, including some activities that are mercifully free or low cost alongside events that may require some splashing out, writes Eleanor Spencer. Summer at the Museums The University of Cambridge’s museums have come up trumps this year with a huge range of activities for little one, and most of them are free. The Fitzwilliam Museum is offering family-friendly outdoor sensory play sessions designed by artists Play Build Pla…