An outdoor multisurface track, with indoor pitting with all the bells and whistles such as power, heating/aircon, shop and good food with a nice bar.
Inside with the pitting a nice indoor clay track, american stylee.
got to have some form of entertainment ala bull ride etc, vrc stands with controllers fitted to play against others when not on the track.
sleeping accomodation??? could be good for weekend events.. but it'd have to be pretty big.. but as id won the lotto i'd not care

club for night life!
ok im talking over the top.. but it'd be frickin ace.