Some nice ideas but unfortunately the better half won't let me take the juniors across the water yet!
Last time I managed to persuade her she changed her mind half an hour before departure and flight plans etc. all had to be cancelled. I ended up going on my own the next day!
Bembridge is another option although as you rightly pointed out, there aint a vast amount to keep kids entertained.
Pity there isn't a strip somewhere near one of the Dorset coastal towns.