Put away the books. Even if you could study for the types of questions presented on the LSAT, it's too late now.
Pack up. Your registration kit contains a list of recommended items for test day. Don't wait until the morning of the test to sharpen all those pencils.
Get your transportation details in order. Gas up the car, confirm car pool arrangements and directions, check bus or train schedules, and so forth.
Set your alarm earlier than you think is necessary to allow for last-minute emergencies.
Catch some Zzzs. At this point, you're as ready as you're going to be, so try to meet the challenge well-rested.