I just played a rather ful level... After being told I need to assasinate a mark before he gets somewhere and assume his identity, I paraglide behind a series of cars, catch up to the mark, land on the roof of then steal his car (kicking him out in the prosess), jump out, punch the f***er in the face to kill him, shoot the escorts and move on to complete the level.
Damn this game is fun. San Andreas is oh-so lame in comparison.