If you want to seriously have the best chance at catching some big fish use these guys!
http://www.maverickyachtscostarica.com/ Maverick is american owned & operated.
Costarican Captains and Mates.
On average they catch more fish than anyone else.
Their secret is their custom made Maverick boats.
The Fly boats always do very well and frequently win the billfish tournaments in Los Suenos.
Call them ASAP as they book way in advance.
It is the rainy season/slow season so you may get lucky a find they have availability.
They will allow you to bring girls on the boat too.
However I would recommend against bringing girls on all day fishing trip.
It just doesn't seem to work out well.
If your serious about fishing focus on fishing during the day.
When your done fishing focus on pu*sy.
Bringing girls on the boat is way to much of a distraction and problematic.
The crews lose all motivation to take fishing seriously when naked girls are running around the boat.
The boats are at Los Suenos about 10mins or so from Jaco.
Hope you give us a trip report when you get back.
Buena Suerte