Golf, - So boring
robbing gas stations, - Gets old real fast, always the same
watching movies, - not bad, but I want to play a game, not watch a movie, otherwise i'd... watch a movie
going to the strip club, - lame unless you're 12
drink with friends, - as above, lame
invest in the stock market, - can't affect it, boring
tennis, - just no
hunting, - role playing, not an activity. hunt what? coyotes? yawn
shooting range, - not bad
races, - old fast
triathlons, - tap tap tap tap tap tap tap tap tap tap tap tap tap done
yoga, - just horrendous
customizing cars, - one of the few decent activities
skydiving, - quite fun
ride the "Ferris Whale" and the roller coaster, - incredibly lame
Ride the tour bus, - yawn
visit the Playboy Mansion (Personal opinion on whether or not this is an activity), - fun! if you're 12
fly under bridges, - right...
build a "spaceship". - you don't build anything...
You can explore the ocean, all the alleys of the city, the countryside, etc. - aside from the fruitless jetpack hunt, there's nothing to explore, literally nothing to find or do.