Just found the forum, so not sure if you made your decision. I have been living here for 8 years in CR, so I have seen most of the places grow to what they are today. Which means, there are a few good options wherever you decide to travel to in CR. In Jaco, there is only one I would suggest for girls. In Guanacaste, anyone who asks me, hands down WRSC. The suggestions are based on the fact that both are owned by die hard surfers and that is what you are going to get.
This is my first post so I am not allowed to offer links according to the rules. I follow the rules. Personally, I would not choose a place that show a nubile girl on their main page video, it kind of gives me a bad taste as to what they are suggesting. For the record, maybe it is the owners wife, I could be wrong and I do not want anyone mad at me?
There are more plush options like surf camps that really are not surf camps but hotels stays with an surfing itinerary. So I thought I would offer my 2 cents. Either way be careful when you come to CR, watch your bags, especially on the buses, and enjoy yourself