Like a twist on the genie's 3 wishes, how should we use the first time machine.

Here's the rub, some theorize that the time machine can never go to a time before its creation. Others say that it may be possible to go back father than first thought.
So lets assume that going backwards will work as well as going forwards but it can only be used 3 times.

I am blocked and can not come up with 3 meaningful or even funny missions.