There is a female announcer for the rowing/canoeing events.
The beach volleyball uniform is a bathing suite. For women a bikini, but with 60 degree temps that too cold so at least the US women are wearing what appears to be wet suit tops over the bikinis. The men are wearing what they typically wear, swim trucks and tank tops. That's pretty standard for the pro beach tour, and actually if they aren't filming on the beach tour they'll just wear swim trucks and no tops at all. Now what some of the women are wearing I have no idea.