Wander the old churches around the neighborhood
Inspect the interesting crafts, souvenirs, and trinkets for sale in the central squares and surrounding markets, and watch children play with various entertaining toys, balloons, balls, etc.
Buy an ice cream and/or a churro relleno a stick of fried dough rolled in cinnamon and sugar and filled with your choice of sweet, gooey, substance.
Watch a music or dance performance
Go to at least one art/political/cultural museum.