Ooooh I love St. Augustine too! It's one of my favorite cities in this state. :) This list of attractions should give you ideas about what to do there. In my opinion, top must see attractions are El Castillo de San Marcos, Old Town and go to the Spanish Quarter (fun!), they also have great fudge in Old Town. :p The Fountain of Youth, you can see the original cross laid by Ponce de Leon in 1513 and drink from the fountain (sulfur water) and the grounds there are lovely with peacocks all around and there are lots of artifacts from the Timucuan Indian tribe (now extinct) and a burial ground there. Mision Nombre de Dios is lovely as are the trees around, not a total must see, but nice if you have time. There's also the old jail, Ripley's believe it or not etc etc. :) This site has a nice slide show of attractions as well so you can see them and see how they look to you.:)