If you really want to get ahead, I would read the intro books that Moonlight recommended provided you read them at the beach. As Frigid also mentioned, don't bother reading the texts before uni starts; you will not only forget everything but you will almost certainly find it difficult to understand the material without going to class and you might read alot of unnecessary material. If you attend the intro to law class this is good enough. They will teach you the basic skills in analysing a case (eg knowing what hte material facts are, spotting the legal issues, what the ratio is etc).
Enjoy the next one month of your summer holidays - take a short break around Australia somewhere (eg I just came back from Tassie, bloody beautiful), go to the beach, exercise, get your P's, go shopping, work, go to the movies, or do all those other things that have built up over the last year but didn't get a chance to finish ...just relax and have fun.
Starting uni refreshed, calm and ready for some work is the best thing you can do to prepare yourself for uni.
Also attending O Week will help you prepare for uni in general so you won't be stressed out on your first week trying to find your way around campus (you know where the library, student office, social activities you can join at uni etc) and you might meet some people.