Grand Theft Auto 4 (GTA 4)
main thing i have noticed about fav activities, by not googling, is Roman pretty much does anything without hurting how much he likes you.
Packie likes drinking alot =]
Little Jacob i just took out eating alot.
Dwayne liked bowling alot for some reason.
Brucie liked his heli-tours, and the strip club
but to get 100% as you already know gotta take them on all activities. but thats just what i did to get them all to like me 90%+