Man, if you could only time travel once and it was for only long enough to give yourself a kick in the pants... we would accomplish some great things!
Or not -- I'd probably just go back in time and tell myself to mine bitcoins, then take preemptive retirement
Ah, somebody is always gonna game the system aren't they? Haha. Mine bitcoins, invest in Google, Apple, or virtually any .com and sell out at the right time.