I'm staying at my sister's place. She has her old set of Famous Five books lined up next to the loo.
I was more of a Secret Seven fan myself but I picked up Five Run Away Together for a quick stroll down memory lane.
George (the tomboy and don't you dare suggest anything else) has her own island, Kirrin Island, with a ruined castle and everything. They row out there to escape the tyranny of the family cook, staying for a week and rescuing the kidnapped daughter of a millionaire.
Note absence of life jackets. Also, although they pull the boat well up the beach 'because of the storms that can come up suddenly in the bay' they don't have any trouble with any pesky tides.
But apart from that, a much more realistic depiction of rowing than Titchmarsh's. Blyton doesn't use words like 'evanescent' either. And the illustrations by Eileen Soper are charming and evocative.