The Rana de Suerte (Lucky Frog) sits high up on the Universidad Civil, dishing out good luck to all that look at him. But first you have to find him! From Plaza Anaya, walk around to the other side of the building and look for the fortunate amphibian amid the carvings of the Catholic Kings Isabel and Fernando. That's where my help ends. He's hidden in this picture - click on 'View Full Size' to get a closer look. I'm not sure if the luck can be transported through the Internet, so you might need to go to Salamanca to feel the full effects.
Once you've done that, look for the astronaut and ice cream cone in the next picture (this one's much easier).