For mongering purposes SJ is much better than Jaco & there is far more to do around San Jose & it's suburbs. Jaco is an ugly beach (black sand) smelly in many areas & hot as hell! You are limited in many ways in Jaco for meeting Latinas. Store & window shopping downtown has yielded decent results at times for me. If nothing else you have HDR & the MPs.
Jaco has a lot of beach bum burned out hippy types IMHO. Nothing wrong with this but it doesn't offer me much. Depends on what one is looking for.
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Definatly go take a day trip and go white water rafting down the Paquare river.
I 2nd this idea

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