UK holiday this year - where shall I go?

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Just me and dh. We are in the south east so dont want anywhere round here. Im thinking Cornwall, Wales, New Forest dh likes to walk I like somewhere near a big city/town so I can check out the shops and stuff and see a bit of local life. We could do airbnb or a self catering lodge type place. Two weeks in July before the schools break up.

Any ideas please?