Interbus will get you from Jaco to Coco Beach. However it wouldn’t be my first choice, especially with two people. The time you spend doing pickups and drop-offs at other hotels and most likely changing vans at some point can double the trip time.
They charge per passenger. In my experience the charge for two passengers will usually nearly pay for a private driver.
I would talk to Vanessa to get a quote. No obligation, but you would know the no hassle door-to-door cost. She has a four door Hyundai, not the biggest vehicle, but probably adequate for two plus luggage.
https://shuttle506.com/ WhatsApp +506 8518 5725
I have also used the private van service at Cocal a few times. They were priced comparably to other vans and delivered great service.
www.Translizano.com +506 8823 5294 Gas is quite expensive in CR, the full van will probably cost more than Vanessa with a small car.