I'd probably catch a couple of gigs, y'know, Woodstock, Isle of Wight, Hendrix, Iggy, Miles Davis, floyd, Nick Drake, Led Zep, clash, Refused etc etc
It'd be good to see herds of bison, a dodo, a quagga, dinosaurs.
This time machine moves in space as well as time right? South America here I come.
Bring back advanced green energy tech, or an antidote to hate and war
And spread some seed through time.