If you don't have a lot of baggage you can walk out in front of the airport and catch the bus into town. It will be really cheap as opposed to taxi. Ride it to the final destination downtown and then catch a taxi to the Coca Cola. Believe me, all taxi drivers will know where you are talking about by just saying Coca Cola. From there you will have several buses leaving for Jaco throughout the day.
In my opinion, the best thing to do would be to hail a taxi outside of the airport and have him take you to the Coca Cola station (About a $20 cab ride). This is the main bus station in San Jose. From there you can catch a bus (About $4) to go to Jaco. Make sure to check out Costa Rica Waterfall Tours while you are in Jaco, they offer the best tours in the area!
Nope, if you are taking the public bus it is around $4.
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