Alnmouth is a very pleasant place to stay, having a station which links you directly to London, Edinburgh and Birmingham, to mention just three places you might be trying to get away from. It is on the Coast and Castles cycle route (NCN1) and is well-endowed with pubs and tea rooms. We (Ruthie, Mrs. Wow and I) hired the Family Room at the Sun Inn, which was very reasonably priced and would, at a pinch, take up to 5 people at an even more reasonable price.
The pub serves a range of ales and very good food. Friday night was Steak Night so Ruthie and I both partook. Sadly, once I had had the chowder starter and mains (I had lamb shank on the second night) I had no room for pudding, which was a shame because there was one of the Sticky Toffee variety.
Highly recommended for a weekend break or part of a tour. Berwick is only 20 minutes away on the train, although rhe tickets are expensive, at £12 for a single.