You guys won't be able to declare right away. So, don't spend any time bugging out about majors/concentrations. Also, yeah, double-majoring is cool. But, keep in mind, many majors require a written thesis. One thesis is a heap of work. Imagine writing/editing two, doing the research for two, trying to schedule regular meetings with two different thesis advisors.
Two majors on top of the core is a lot of work to plan for before even setting foot on campus.
Also, JML, there's no longer an International/Foreign Relations major or concentration. I think that they did away with them in the 90s.