Witch Olympus lens you bought for the documentary. The 11-22 or a other one.
I've got the 14-54mm, but actually the 11-22 would make a pretty slick lens for handheld, I bet.
Didn't think too much about the windsurfing part, but yeah, you'll probably want something more tele (although 140x2.6= 364, or the equivalent of 728 on a full-frame, which is pretty far out there.)