very cool, flamenco beach is def one of my favorite beaches. I also loved the bio bay, but realized i like the kayaking part of it more than actually swimming around with the dinoflagellates. Now all I do in PR is bum around the pool all day and then play poker at night in my hotel getting drunk for free before hitting SJ.
I've only gone to PR in the summer, but i heard in the winter there is some good surfing and whale watching in Rincon. did you check any of that out?