Flabuck wrote:
Having no plan set in stone is a good way to approach your trip. Considering you have four days, I would suggest a couple of tours, a city tour either through a company or wingman expat on the ground to get a feel for the city and maybe some type of tour outside of the city to see some sites and to get out of San Jose. The country is not just one big city, you can do beaches, mountains, volcanoes or adventure sports for a day.
Actually, in a 4 day trip, I'd skip anything not monger-related. Get laid as much as possible, and plan your return trip while you're at the airport going home. A 7 day trip is better to 'see the sites'.