While the bar is open until midnight, IMHO if you haven't found one by 10:00 PM at the latest, you should move on. I would suggest a Tico tour, and then to the KL for a late night hook-up. You don't even have to know how to dance, just stand their and shake that thing. The women in CR can't stand seeing a male butt shaking, without attaching themselves to it.
The ladies at the SL, with a few exceptions, don't stay long if they have no customers. They usually come in, at least in pairs, and if no business within an hour, they are out the door. Some of the "regulars" stay for hours though. The rate of women coming to the SL seems to be improving with each trip I make, in numbers, and in looks. I have only made four trips to CR in about a year and a half though (does that mean I'm hooked?). Unless there are games on TV, and you see one you like, you should pull the trigger fast. If there are games on, it seems that most gentlemen will want to watch the game, so you have more time to select.
The hottest looking woman that I have been with in CR was apparently a very part-timer at the SL who was smokin' hot. A 19 Y.O. university student with a body to die for. She is one of the few women in CR I can honestly say looked better out of her clothes, than in them. I would put her in the top five of women I have been with anywhere in the world. I only saw her that one time, and I have not seen her since.
Good luck on your search.
Steve - Santas Bro