If it's South this time .....Cornwall would be my recommendation especially for a family ...Many attractions and scenic places within easy reach if the weather is inclement (Two Coastlines to choose if the prevailing winds are bad
) .....Somewhere like Falmouth where you could put in for the week has a good slip (if a little busy at times) plenty of GREAT Cruising grounds East or West pluss the large Estuary/River network to explore if you need sheltered waters ....loads of amenities vast choice of accomadtion (and prices) from Hotels to Camping!...Good fishing/Wildlife and mild climate...and generally a nice well kept Town /Sea port.
Book early!!...
I'm off to Lauch the Boat ....now nr Oban ...Bonnie Scotland!
.....Bright Sun!.. and light winds!!