I would agree with the later date - 20s or 30s, too much leg on display for 1913. Looks like an attractive spot; if not around old New Brighton, pre-sea wall, could be North Wales, maybe not Wirral? There were good train links into Wales.
I agree that its unlikely to be as early as 1913 from the dresses.
I thought Wales looking at the shape of stone used on the smaller buildings, but the extreme flatness and sharp corners of the walls is not very Welsh(?) and I'm not sure about the English poster in Wales pre WW2?
I'm also wondering about how storm-proof it looks considering it is right on the beach, rules out New Brighton?
Buildings are quite dense which also rules out any New Brighton beyond the old prom - and the old prom is missing so can't be there either.