Greetings Rhatfield,
Sorry it has taken so long for someone to reply to your question. BTW, this kind of question might get a wider audience in the Newbies' or Girls Review sections.
Outside of Jaco, Tamarindo/Flamingo (Guanacaste') and San Jose, there is very little open prostitution. Here's a short list of other venues:
Quepos/Manuel Antonio: Itsamana (private club), Bar Rosa, maybe some street action near Wacky Wanda's bar in Quepos. Beware of und***ge girls here.
Puerto Limon: Some gatherings of ladies early in the evening. Weekend parties may host a half dozen girls or more.
San Isidro del General: Bar Mexicana, NW of the town square.
Puntarenas: The Green Door and several other dive bars. Puntarenas is a filthy, dangerous little port town... some guys love it. Play-for-pay here is in the $10.00 - $20.00 range, with looks to match.
La Fortuna/San Carlos area: Some bar girl action, very discreet.
Aside from Manuel Antonio, I have no first hand knowledge of the places I've listed. The list above is based on what I've read here on CRT.
Remember that the further away you get from the traditional and well-known "hooker hot spots," the more likely you will be able to find a non-pro for traditional dating and mating. Although not technically prostitutes, many ticas will gladly share your bed, and will appreciate a small gift or cash tucked into her purse the morning after. How's your Spanish? Your chances of scoring (pro and non-pro alike) outside San Jose will improve with each level of Spanish you can speak and understand. Good luck, and be sure to report back here with your findings!
Welcome to CRT!