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I would go back and just watch the dinosaurs live. People have speculated that the T-Rex was about as intelligent as a cat. Did it play with its prey as a cat does? Did it train it young to hunt? Inquiring minds want to know.
Although I suppose you could go far enough into the future to look up your own obituary, then go back to that date...
But my question is...what would you be trying to learn by attending your own funeral...? I think the risk is that, were it possible, it could fundamentally change what you think of some people, even closest friends and relatives...would you risk it?
I'd go way back to the moment life began on Earth. Not human life or dinosaurs or insects... the very first spark of life.
The Beer Prayer - Our lager, which art in barrels, hallowed be thy drink. Thy will be drunk, I will be drunk, at home as it is in the tavern. Give us this day our foamy head, and forgive us our spillage as we forgive those who spill against us. And lead us not to incarceration, but deliver us from hangovers. For thine is the beer, the bitter and the lager, for ever and ever. Barmen.