Excuse me I live on the West Cliff in Bournemouth Hunter and it's a great place to live. The beaches do get crowded in the summer but there are plenty of beaches that aren't. Southbourne beaches are relatively uncrowded because of its distance from the Pier and centre of town. We have found that the usual holiday maker likes to be near to the facilities so prefers hunkering down with loads of other people. I'm a 10 minute walk from the sea, if I walk straight down, crowded beach - however a walk to the right and a few beaches along fairly peaceful. Our summer season is short so the rest of the year the beaches are great. You also have the whole of lovely Dorset to play in, including the Purbecks and the New Forest . Bournemouth is the biggest town, isn't that big, so you can imagine the size of towns like Dorchester. The countryside is beautiful and varied. Southbourne Margaret is a nice area with some lovely houses and flats, good little shopping street with lots of local shops.
I've lived all other world including Geneva and New York. When my ex and I parted I came back here to be near his mother in Bournemouth. After NY it seemed very old fashioned. However, my children then aged 5 and 8, loved it and I came to love it very much. I made a good decision.
One week in the winter? No wonder you didn't like it. Try a lovely warm day in June, walking along the proms with the other locals enjoying the views, nice cafes and an empy beach. Any other help I can give you Margaret send me a private message. There aren't many Dorset GNers so you could join us for a meet up one day. We will certainly meet up in Bournemouth.