Excuse me for being confused, but your characters are just arriving at camp? I figured, since their age, that they would have already been at camp for several years. Most Demigods, well according to the series anyway, came to camp at a young age. I was thinking that maybe they could already be somewhat trained, experienced, and comfortable with camp? If they were about five years younger that kind of introduction would make more sense. If you aren't really okay with that idea I could try to go with the thing you had going before.