We spent the weekend on Alderney. We went there to muck about on the beaches and we were not disappointed. The water is still fresh at this time of year, but I cannot think of an island with better beaches.
This is a photo taken looking out to the Fort from Longis Beach on the southeastern part of the island. Alderney is famous for its powerful tides and you can see how churned up the water is getting on the left halft of the picture, as it races across the causeway.