Kayaking and canoeing for both genders - "Bringing Together The Water Divas & The Water Warriors"
http://www.paddling.net/guidelines/showArticle.html?479
"As an experienced female paddler and instructor who has taught thousands of women, I've observed that women have a unique approach to paddling. In my own words I would say that women, in general, feel more confident when they're surrounded and supported by a group of other women, especially when they're faced with situations that challenge them. Women tend to be more cautious on the water, enjoy going at a slower pace, especially when learning, and feed off of the support of their peers in a very positive way.
In contrast, it has also been my observation that men tend to be more physically aggressive in stressful situations and that they are much more likely to get pumped up with adrenaline and throw themselves into rough waters whether they feel like they're ready or not. Men don't seem to need much group support to muster the courage and confidence they need to tackle challenges."