One idea is to stay in San Jose your first 2 nights. Spending you whole vacation in San Jose is a waste of time and money. I am not going to San Juan to find somebody. I mean, it's not Indonesia, after all. I would also check with how gay friendly it is where you are going. Costa Rica is an amazing Country with lots to see and do and the nicest people.
Maybe do a search for them on Facebook for some ideas.
Thanks for the answers, but It leaves me with my questions unanswered, maybe because I wasn't clear. Head out to Manuel Antonio for a few nights and enjoy the diversity. I understand that pick pockets can be problematic around the mercado central central market and the zona Coca Cola is probably best avoided unless you have to make a bus connection there. Log in to get trip updates and message other travelers.
I am straight acting just stating nor judging anyone else behaviour: