@Saurus72, Embleton Bay, not far from Alnwick. Ssshhhh! Copper sands and quiet, quiet. Bamburgh is all fur coat and no knickers. Forget Alnwick Castle (unless you have die-hard HP fans) in favour of the Gardens (particularly in this Covid/post-Covid world). We went to the Castle last week (free pass and it was a pale imitation of itself). Seahouses will most definitely not be for you (apart from as the start-point for a boat trip, but you are there in the wrong time of the year and also to visit the very moving Grace Darling Museum and grave). Holy Island is amazing, don’t forget to check the tide times. The castle is really quirky, the abbey very boring but the best bit of all is the free coastguard station lookout, you can see for miles and miles. Other highlights are the walk up to Dunstanburgh Ckastle from Craster (you could tie this in with a visit to Embleton Bay)
I’ve got my thinking cap on so will post more suggestions shortly.