www.usajobs.gov has a listing of federal job openings by state. That might a place to start to see what interests you. Perhaps something in Homeland Security.
I worked for the Federal government right out of college. One thing I will tell you is that there is a lot of politics throughout. In a lot of agencies you are rewarded for the processs and not the result. You are rewarded for making the boss look good and not have something uncomfortable or controversial to deal with.