I hate to be "that guy," but I can't be the only one who is already preparing both mentally and physically for the next semester. I know, summer has barely begun and the last thing you want to think about is school. You have these 3 short months to enjoy the sun, and the lack of homework, lectures, and tests. The famous saying says that those who fail to prepare, prepare to fail, and it's true. If you just try to "wing it," and get your class list the week before the semester starts, you are setting yourself up for problems.
Sure, that kind of tactic works for some people, but for the rest of us, it's disastrous. Personally, I always run into speed bumps and problems when I put things off until the last minute. For that reason, I am doing things right this time around. By having all my ducks in a row early on, I will be able to leisurely relax and enjoy the rest of my free days before fall rolls around again.
The first thing you need to do is make sure you are registered for classes, and that you have your financial aid figured out. Waiting to ensure you have your funds for classes straightened out is never a good idea. Because you frequently need to submit follow-up paperwork, and response time can vary, you should have already done this back in April. If not, it's ok, you still have some time. You should never assume that financial aid and registration will go smoothly, because there are so many things that could go wrong. Each school is different, and you never know why your account may end up with a registration hold on it. It's best to get registered for your classes before the spring semester is even over, but you can still do it all the way up until the first couple of weeks of fall semester, usually.
The next step is making sure that you have all the supplies you need. This will depend on how you are taking your classes. If you are taking classes on campus, and maybe even have labs, your materials will be different than online students. Make sure you have tablets, pens, pencils, and whatever electronics you need. Typically you will need a laptop, and possibly a printer or graphing calculator. Depending on your major you may need more or less, so make sure that you check each of your class's requirements. Buying new electronics can be quite a process, especially when it comes to your education. Do some shopping around, and find the best deal out there. There are plenty of great sites where you can buy your electronics from, Amazon being one of the best, unsurprisingly. Some classes only work on a certain type of computer, so be sure to read the fine print.
Lastly, make sure you have your schedule all planned out and practiced. Yes, you should practice your schedule at least the week before classes start. You need to get your body back into the routine of waking up early and functioning well enough all day so that you can get your learn on. If you have a job (or two), you also need to make sure that your communication is open with your boss, so that you don't run into any problems when fall comes. Make sure that they understand what your class schedule is like, and let them know what kind of hours you are looking for. You need to decide what the best hours will be for you, so that you don't get burned out after a while.
Now that you are prepared for the next semester, go out and enjoy your summer! As long as you have everything figured out as early as possible, you won't have to think about it again. You are doing yourself a huge favor by planning it out and preparing early, and possibly even saving yourself a lot of stressful times. It's no fun to think about school on summer vacation, but it's just getting you that much more prepared for adult life, when summer means nothing but a few holidays and long nights.