Simple.
I'd travel back to June 16th, 1967.
Three words.
MONTERREY POP FESTIVAL.

Otis Redding, Jimi Hendrix, The Who, Lou Rawls, The Birds, Jefferson Airplane, Booker T & the MGs, and the Mamas & the Papas.

To ****ing die for.

Oh, while I'm in 1967, I'd definitely go see a Stax/Volt revue concert somewhere in Western Europe. Absolutely insane concerts (remastered DVDs ftw).

I'd have to exit 1967 before December, though.
I don't know how I would've handled Otis Redding dying in that plane crash.
He recorded my favorite song of all time literally hours before he was killed.
:\