Back to 1 minute before the birth of the universe with a good camera.
Forward to 10 minutes before the actual moment of death of the sun, with an equally good camera. Blast shields included.
Back to when the very first creature set the very first steps on land. Again with the camera. Hazard suit.
Forward to the last human to die on Earth. And then interview his relatives. Camera comes. Breath mask too, wouldn't want to rush their demise.
Back to the strike of that Yucatan comet. Camera included, and a space suit.
Forward to the actual moment of outbreak of Global War IV. Camera included.
Back to Hitler's choice to become party leader of the NSDAP. Camera included, the diagrams for a nuclear weapon, and an autograph booklet.
Forward to the exact moment the Earth's crust can no longer withstand the sun's expanding mass, and breaks apart under the pressure and heat. Camera included. Space station, radiation shields and hazard suit.
Why? Because these are critical moments in past and future, and I would love to actually be somewhere where something happens for once.

I always arrive too late. Bank robbery? I arrive after the police get there. Train wreck? I took a train earlier. Plane crash? I'm underground.

So yes, for the sheer spectacularity of the moments, or their historical significance, I would love to be there. Not necessarily do anything but watch.. but it'd be awesome to be able to say, "I was there that day."