I would buy / lease an island. Move to it. Say my final goodbyes to humanity. Buy a rather large telescope.
Maybe open an endangered animal preserve on the island with me.
( Dino's optional )
Food / supplies can be air dropped periodically. Get a pilots license for when you have to venture back to civilization.
Retire. Enjoy life as it's meant to be instead of being a wage slave who spends their life doing nothing but sitting in a cubicle, working to pay off some debt.
Travel, see how the rest of the world really is vs what the media tries to portray. Keep a low profile, be humble.
Maybe start another Nobel prize sort of thing for stuff you consider important. Try to make a difference in the lives of those who aren't as fortunate. Disease research, fresh water projects, clean energy research, etc. There is an awful lot wrong with the world that funding can help with. I wish the folks who keep buying yachts, mega-mansions, and their seventh gold plated Ferrari would understand that concept.
I mean, seriously, how much money do you need to live an amazing life for the rest of your days ?
Figure that out, then become a name that folks will remember for making positive things in the world a reality instead of the usual ultra-rich and greedy we usually get.