i will be traveling to this fine country, and would like to get some feedback on where to go to hobby.
I have heard that the "bars" are better then an agency, as  you get more of a selection. I will be staying in the Quepos, San José area.
Any help is much appreciated.

If you are in San Jose, you should check out the Blue Marlin bar and/or stay at the Hotel del Rey.  There are wall to wall girls there from all over central and south america.

The site http://www.costaricaticas.com/ has some great info about hobbying in Costa Rica.  They even have a map in the VIP area that shows all of the bars, massage parlors, and hotels of where to meet ladies.  The VIP is worth the money as it gets you discounts all over the place.  I made my money back just on my room, let alone meals and services that were also discounted.

The Sportmens Lodge is a great place to stay as they do not charge to bring ladies back to the hotel and they have a bar that many ladies frequent, right in the middle of the hotel.

Enjoy!