Do not attempt to contact the girls at ZB off premises or make a date with them.  You will see signs to that effect throughtout ZB.  It is rumored Doug PI has been retained to ensure compliance with this policy.  However, for $55 (per) you can have an hour with the talent at ZB, including shower and sauna ($42 if you upgrade to VIP status).  
 
If you are trying to go out and pick up girls (non-professional) and speak Spanish, run some searches on this site.  There appears to be plenty of places one can find girls.  I think you will find Costa Rican girls are like those in NYC, Miami, LA, Sao Paulo, etc, IMHO.  
Most importantly, be safe and have a great time.   
