Good Thread - sensible comparisons.
Looking at original question and the "kids" issue , I think Whitby will keep them fully occupied in all sorts of ways that Cambridge can't and girl friend will be able to escape the music on occasions if required.
Good food, drink , here's even a supermarket in the centre for soft drinks / sandwiches / fruit. Escape from the music for a while ? - go on the choo-choo North Yorkshire steam railway.
Besides all of that - I think Whitby is a better scenario to expose young 'uns to music and dance.
Anyway good luck in arriving at your decision, and note Big Al's earlier assertion , (with which I heartily concur) as it is a most important issue.
Betsy.