Pay off debts.
Fix up some minor health issues.
Give my SO enough money to live comfortably... somewhere else.
Set my kids up with a house and a trust that paid the (taxed) interest of say 2mil into their accounts. They can work or not.
Buy my Dad his own place fre and clear, and buy his shares, that were reduced to practically nothing in the GFC, at pre 2008 prices.
Give my 3 siblings 2mil each.
Do a few things my Mum asked me to do before she passed away.
Build my dream house, which is rather large and includes a library, writing room and (small) recording studio.
With that much, it would be tempting to make my town car a Bugatti Veyron, but definitely some kind of new car that is somewhere between practical and sporty.
Travel. Lots and lots of travel.
Finance a TV series I've written. Hopefully one should open the doors to more, like a showreel or calling card.
Do a 'Secret Millionaire' kind of thing, without the cameras, help people who really need it, without looking for glory.
That's enough to be going on with.