I remember listening to an audiobook where an alien came to Earth in a talking spaceship to escape from alien pursuers. The spaceship left to distract the other aliens. He changed his features to look human and survived by changing objects into gold. Possibly, he got a girl pregnant.
He realized the hostile aliens now know about the Earth and would return to invade someday. To obtain funds to prepare for this invasion, he entered into a golf tournament with his human girlfriend as his caddy. He set up a factory off somewhere to make spaceships to prepare for the invasion.
Apparently the alien learned to play golf by watching TV and also just copying the movements of pros. He was a quick study. From what I remember, he didn't want to sell too much gold in case people got suspicious as to where he was getting all his gold. He also was investing in stocks; he was rich but needed even more money and the golf thing was supposed to be cover for how he got so rich. I forget if he was preparing defense of the Earth against his own kind or a separate alien civilization his kind was at war with.