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Download the orientation app ([link]). Be prepared to stand in exceedingly long lines. Attend the required events. Do not feel as if you need to attend any of the others as there are plenty of other opportunities to explore. If you know Austin then do a little exploring, just don't venture too far from campus. The Drag has some fun restaurants, for example.
Make sure you bring toiletries. A towel and soap is a must as the bathrooms are literally empty. The rooms were fine for me, but hey, I'm originally from the north so cold doesn't faze me. Other people say they're somewhat chilly.
If you bring a laptop/tablet, they will have you line up outside the student services building. It is not required that you stand in this line to register for classes. It is easy enough to just go online at 2:00 PM and choose from there. Registration can be done at [link] and the course schedule can be accessed through [link].
If you're a CS student, make sure you spend as much time as you can in the CS building. Maybe I'm biased, but it's that much better than any other building on campus.
Bring money. You can certainly get away without it, but if you're like me and you like adventure you might need it. If you plan on staying in your dorm all day, then hey, maybe you can survive on the meal card.
Be friendly. Say hi to your neighbors during events; you'll make friends from that alone.
Just make sure you register for classes as close to 2 as you can get. They will certainly open some for this orientation session, but you're also competing with all the kids from previous orientation settings trying to steal a better spot. Be ready.