The top two were the ones I was going to suggest.Holy Island ( watch the tides)
Bamburgh Castle
Sea houses (poor mans Whitby)
Was actually going to say that.Ford and Etal mini railway for the nippers.
Also Alnmouth is really niceAlnwick castle and gardens are well worth a visit (and Alnwick itself)
Wooler is actually a good shout.Dont miss Holy Island.
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Amble is a wonderful place.
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Dunes and beach south of Bamburgh are often deserted.
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Wooler is also worth a visit