Tallinn has two ""L""s in it! ;)
The Old Town is quite near the port so you could have a quick walk over there! Maybe even stop at the pancake restaraunt Kompressor (Rataskaevu street in the Old Town if I remember correctly) if you're lucky enough to visit it when it's not full. There are also some awesome sculptures called "Black monks" near Toompea in the Old Town, don't hesitate to ask people about them if you can't find 'em.