I'd do the basics you know, discover electricity, calculus, the atom, disprove ether, get my name on a **** load of mathematical theorems, thermodynamics.
Refine weaponry, cannons, hand cannons, hardened steel.
Cure smallpox, introduce boiling water, invent the steam engine, refine crude oil, make plastics, make a rudimentary petrol engine.
Flight, using said engine, radio, the type writer, refine optics.
Conquer France, ask about finding an alternative route to India...
Then when I'm realised as a mega genius and in a position of huge power and wealth, say that the earth revolves around the sun...