Iāll do boring stuff like going into the future and back to win lottery tickets, buy an island and a chopper/yacht to get there and then keep it in case the world needs saving.
As for the money - obviously Iād use it to feed myself so I can laze around and read/watch stuff all day. On a good day Iād donate some to different charities and perhaps do other charity work. Aside from using it to buy stories to read and items to use in games, Iād also use it for my continuous Netflix subscription and Iām sure most of it would go to travelling to different parts of the world - esp. in New Zealand, gosh darn that place is so beautiful! I wanna go back there ASAP!
I digress, lolz.
TL;DR Iād spend money I get from using the time travelling machine on selfish stuff and then spend some on selfless stuff so help balance things out