I don’t know if it’s the way to meet people, but it does seem to work. Paddling and beach volleyball both seem to be geared towards getting large groups of both sexes together in a non-creepy environment.
But if you want to get all tangled up, you might as well take a yoga class. The studio I went to was www.pranayoga.com. Good looking women in tight clothing, and you can sit down afterwards and have tea and cookies with them. What’s not to like?