You can't imagine correctly. Rumor has it the early birds get a hair cut, then there is a reception with the Supe for them in the bowels of Alumni Hall, bagles, lox, hot chocolate, and they have video games set up to help the soon Plebes-To-Be relax.
Enjoy!
Don't over-think this. They'll do ALL the thinking for you that day! Just keep your behind on the bulkhead and eyes straight ahead ... and all around! Anchors aweigh!