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Park at one of the park and ride sites. There are lots of them. Much cheaper than the busy car parks and very frequent. Lots if places to eat. Hope the weather is nice because Cambridge looks lovely in the sunshine
I like the Archaeology & Anthropology - it is full of odd stuff! The scott polar musuem is my favourite museum but there is not much too it! A lot of people do go punting in all seasons. They are lots of lovely cafes and shops