Feeding pigeons
The Plaza de La Cultura is almost as full of pigeons as the Piazza San Marco in Venice. The Central Market isn't too far from this spot, so you can go and buy a bag of corn and have some fun feeding the birds, which is what a lot of the locals do at the weekend. The square isn't exactly spectacular: it's really just a concrete slab so the best thing to do is feed the pigeons and the continue on your way through the pedestrian streets of San Jose, or head to the Museo de Oro which is located just beside the square. Don't forget to go to the market for your bag of corn before making your way to this