Well... having finished my HSC, I decided no girlfriends... just adrenaline and the beach.
All that I have done all holiday is surf and kite and drink beer (recently turned 18 too)
It really has been some of the best months of my life to date... 100% serious

Oh and by the way that endorphins thing is so true, I find after doing a hard weights session at the gym or going on a long run or playing rugby or wateva... that feeling afterwards is totally immense, but NOTHING has surpassed the feeling that day when I got when I was up and going on my board...
I've already got a group of angry women-friends who would probably burn my darling kite given half a chance... thats why it stays in its bag... next to my BED