Enjoyed watching that Brazil game tonight, for obvious reasons, but in terms of the games overall, things I'll be looking to watch:
Cycling - both road races, men's t/t and some of the track. The BMX stuff can be quite a watch too.
Rugby Sevens mens - GB up against the mighty Kenya, Japan and, er, New Zealand
Triathlon - Brownlees
Athletics - pretty much most of it, but Holly B in PV, Sophie Hitchen in Hammer, Heptathlon, sprints, 5K and 10K, relays, women's 100m hurdles (where the world record holder doesnt even make the USA team),
To avoid: horses, golf, tennis, anything in a boat, opening and closing yawnathons