VOTE

In order to exercise the franchise (as none of the kids have probably ever said, but maybe should have) you need to be registered to vote.  Yes, some states will let you register on election day at your polling place, but why wait.  Get it done today - it is National Voter Registration Day after all.

Rock The Vote will help you out as will the NVRD website.  If you live in the DC area you should check out the great new resource that is metrodcvote.org.  The site will help you check your registration status, get yourself registered, and figure out absentee and early voting as well.

Be sure you're ready to get out there and do your thing, it's your chance to participate in your democracy and you should do it.  Too few people vote in the US these days with only about 60% of potential voters in Presidential election years and less than 40% showing up to vote in the midterm elections.