<p>Where do we check in? At the admissions office??</p>
<p>If you enter Gate 3 and park at PSX, there will be handy dandy signs that say "Explore USC" to point you in the right direction, which is probably the Admission Center in Trojan Hall. I've seen (and stepped over) the signs...which usually end up face-down on the ground as the wind knocks them over. =D</p>