I need to get from San Jose to Jaco. I don't really want to rent a car based on some posts I have read. Has anyone used a car service/cab/limo? What was your experience?

If you feel like being adventurous, I would advise jumping on a bus to Jaco. After you get to the airport, grab a cab to the "Coca-Cola" bus terminal. It's not the safest place in the world, but using a little common sense should get you through it just fine.