Can I save a camping spot for my friends?

Unless you are in Camp K102, KAT Country or BOB Basecamp (where you can pick your campsite in advance), campsites are first come, first served when you arrive. If you want to camp next to a friend, let the campground manager know. They will do their best to accommodate you but often it is not possible. The best way to camp in a group is for you and your friends to arrive at the same time.