Think the most fun I had in TS4 was making a Super Sim with as many expansions as I had. She actually became a vampire/caster hybrid because of her mom magician and vampire dad which was cool, and I'd make her slave away cooped up in an arts center or bar maxing out her Music/Painting. 99% of leveling her Astronomy was reading level books, until the game forced me to level it with practical means. I'd made a start on maxing her expertise in each occupation until I got bored.
I'm sort of salty the game went F2P because I spent relatively a lot of money on it. I'm OFC not envious per se of the customers now, mostly just kicking myself for not expecting it I guess.