Calling it study is just fine...You get to go on a camping trip with your class? That's cool!!! Personally, I'm pretty much older than everyone in my classes and have NOTHING in common with any of them, so I wouldn't want to do anything with any of them, but things work differently in your country, and you're just about the same age as everyone, right?
I'm around the same age with most of my classmembers, with a few exceptions (some are already well in their twenties). Yeah, we go on a sort of introduction trip for three days to get to know each other and stuff. It was really awesome, made some nice friends.
And man, I remember a few years ago when some 16 year old kid (I think) showed me his American high school books. I was like: fuck that shit, they were right! The stuff they teach at some high schools is shit, even in senior year. That guy said he was doing like one of the toughest high schools or somethin', all I remember is that it was something I did a year or two before I was his age xD