Going to the movies is fun. But, there is not a lot you have to plan or prepare for in order to have a good time. They supply you with everything you need. Going to a drive-in on the other hand, is taking the movie experience to a whole new level. There are things you need to do and stuff you need to bring, to make your drive-in experience enjoyable.
Get There Early
Just because the movie starts at 10:00 PM, does not mean arriving 5 minutes before the movie starts is fine. If you want to get a decent parking spot where you can actually see the movie, you need to get there early.
The other reason you come early is to enjoy the fun before the movie starts. You can get some concessions and enjoy some of the drive-in amenities.
Bring Something You Will Sit On
No one likes sitting in the back seat and trying to see the screen at a drive-in. You may or may not be comfortable sitting in the driver seat of your car for two hours. Bring chairs you are comfortable sitting in outside. You could also come in a truck or a van. This way you could park backwards and use some pillows and blankets to get comfortable in the back/bed.
Pack Some Snacks
Bring some drinks and food with you. There will be a concession stand, but you can save some money by bringing some of your own stuff. Think about what you want to eat and drink while you are watching the movie and bring that stuff with you.
The last thing you want to do is get to the movie last minute, pay for your ticket, and be parked so far back that you can't see anything. Get to the movie early and don't forget the snacks!