Seriously contradict the notion of the game being "in the can", completed and that Rockstar would hold out for any reason. Logic might dictate testing all functions and interaction areas within the game, but that's common among all game builds. The online versus offline elements of the game build also have to be tested to be as fault free as possible.
Regarding the subjects themselves, I wouldn't simply label them leisure activities, since your ability in GTA is to use any vehicle or means of transport anytime in the game, the basic premise of GTA, leaving out the notion that it's only auto.
It's not that long ago we were sky diving from planes on a dangerous mission in San Andreas that wasn't done merely for recreation. As was biking for missions, however, the motorbikes appear in a general race, up mount Chilliad! hahaha