There's a girl in an all-girls school, or perhaps a convent. One night they have some kind of dance, and get to dance with these men, who I seem to remember are convicts, seems a bit strange though. The girl meets and falls in love with one of the men, they then make out in some kind of church with lots of candles around them.
At one point in the film, the boy is running through a forest and sees the girl lying in a pond photographing herself, with all the photography gear.
They run away together and live in a hut on a mountain somewhere but the police eventually catch up with them. A police helicopter appears right next to their hut but they manage to escape somehow by (I think) jumping off a waterfall, and then going underwater through a tunnel.
I would say it's from the 80's or 90's.