My kitties are wild, well two of them are. The third's favorite activity is sleeping, with eating a close second. He's a lovebug though, can never get enough butt scratches.
The other two, brother and sister, enjoy tormenting eachother as siblings often do. Sister goes bonkers over the feather wand toy, and tries to hide it like prey if I forget to put it up high enough that she can't jump and grab it. Her brother destroys the little crinkle ball toys and catnip mice.. so much... There is fuzzy mouse gut stuffing everywhere.. and he's so proud about it whenever he destroys one. They both also love yoweling at 2am.
All three of enjoy share the favorite activity of watching anyone in the bathroom if the door isn't locked. Our largest cat is part maine coon, and can reach the handle, and unfortunately smart enough to turn it enough to push the door open. I don't understand their fascination... Maybe because we don't use a litter box like they do? Who knows.