The distance between Haco and San Jose is approximately 1.5 hours driving time. It shouldn't be too difficult to find out how to get to Haco. All you need to do is ask at the information desk.
From the bus terminal in the Coca-cola area, there are regular direct buses from San Jose to Haco. The cost of a single ticket for such a bus will not exceed 2140 CRC.
You can also get to the resort town by car, renting it directly at the airport. To do this, you will need to look carefully at the signs, and in an hour you will find yourself in a picturesque Costa Rican town.