AEP is similar to other college accepted student programs. Tours and briefings for the parents explaining what to expect the next 4 years. If you are non-military parents, this will be especially helpful as the academies are a little different. If you have an older kid in college, you know most of this stuff.
For the kid, it is a great experience. They try to line you up with a cadet with similar major or sport. You get to eat the food, stay in the dorm, meet the coach, that type of thing. For cadets hosting AED kids, it is an additional duty they volunteer for. The hot tip on AED is the accepted kid needs to let the host cadet know what they are interested in doing to maximize the visit. For example if you want to see the basketball practice and the baseball practice, just let the host cadet know and they will hook you up with someone from each team to get your questions answered. Same for majors, if you are not sure, let the host cadet know and they will set you up with kids/teachers from each major. You will be with one host cadet and stay overnight in a room with them, but based on your requests, you can get passed around a little to other cadets that are more experienced in the areas you are interested in. This works best if you let your host cadet know as soon as you meet them what you would like to see/do in your time there. This is often difficult for the accepted kid as they don't know "what is on the menu" to see/do for the weekend. Remember, the host cadet is just a kid a year or two older, so don't be afraid to ask. Recommend you ask about academics, sports, daily life, typical weekends, and of course swab summer.
Usually the AED kids are hyper-focused on what will happen during swab summer, and that is to be expected. It's totally ok to ask a ton of swab summer questions. But the academy is so much more than those 7-8 weeks, be sure and check out the other stuff too.
Finally, be sure to exchange email/cell number with host cadet, so when you get back home if you have questions as you get ready to report, you can email/text the cadet who will usually give good advice. Most cadets enjoy hosting and will try to look you up during swab summer and check on you to make sure you are doing well. So, they take a longer term interest in you than you may realize on your visit.
Good luck!