Men's volleyball is one to watch if you never have. 6'8 guys touching 12' spiking a ball at upwards of 120-130 km/hour. And Canada is in again this year, qualifying for the 3rd cycle in a row after having not been to the Olympics since 1992. They're in a tough pool but have been in good form coming in to the Olympics, making the semi-finals of VNL (World League). Couple of local lads on the team as well, Golden Bears volleyball alumni.
Beach volleyball might have the coolest venue going, right in front of the Eiffel Tower (cue obligatory women's beach vball comments now haha)