Thank you all for your detailed replies. Think you have made my decisions.

We fly in to Maui so will spend 7-8 days then fly to Kauai for another 7-8 days (I can live with a bit of rain) and then finish with 5-6 days on O’ahu.

it’s reassuring to hear that it will be a great place for my daughter. We were booked to have been in Australia and New Zealand the Feb/March just gone but that obviously got cancelled and glad we did. Thinking she (being another year older) will actually enjoy Hawaii more.

long way off still but very excited already. Managed to snag AA web specials for 84,000pp rtn in business from London so a result all round.