All of it except men's football which has no place in the Olympics whatsoever. However I think it's a wonderful showcase for the womens game.
The best thing about the Olympics is that you get to see some fantistic sports and competition that you wouldn't come up against normal....weightlifting, judo (though rather technical for me), hockey, volleyball, handball and archery.
Personally I'm not a fan of tennis, badminton and table tennis and I don't get the equestrian or the sailing...though I can see that success at the Olympics represents the pinnacle of achievement for these sports.
The sport that concerns me most is womens gymnastics. It's spectalular but certainly not graceful, but it's mainly that many of the competitors are simply too young to be competing in that environment.