Well I am taking Greek, AP Cal AB, Oceanography (took physics/chem already), HN Gov, AP MacEco, HN English, and Sacraments/Apologetics (Catholic School).
Maybe try to seperate your Econ and Gov classes? Take AP/HN Gov and then a seperate Econ Course. Since you're taking marine bio maybe you're like me and already took Chem/Phys. If not those certainly make you way more competitive than someone who hasn't. Three years of a language already? If not take another year of your language. Even if you have three years taking another year can't hurt.
Listing what classes your school offers would help. I know we need two semesters of computer classes at mine to graduate but if you haven't taken any computer classes taking one of those might help a lot. Also how many classes can you take a semester? If it is only five I would not waste one on study hall, which is what I assume you mean by football/track.