I'm fairly sure that this photo was taken at Alnmouth, a village on the coast of North Northumberland. It is only a few miles from Alnwick and has the distinction of having its own railway station on the main East Coast line because although the line was intended to go to Alnwick the Duke of Northumberland of the day refused to allow the nasty thing anywhere near him. So ever since travellers to Alnwick have had to negotiate a hopelessly inadequate bus service from the end of the road where the station is located - which is, if you are being really pedantic, not even in the village of Alnmouth but in a tiny cluster of houses called Hipsburn.
One of the ladies enjoying a paddle, or 'plodging' in the local vernacular, is my grandmother and the others are presumably her best mates. There is no date on the photo but judging by the dress styles and by my grandmother's age I would put it sometime in the 1950s.