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I think that it is better to listen parents. Perhaps the parents can not pay for the trip. And go where either alone is very dangerous. Who knows what will be waiting for you in a totally different environment. I suggest better to go with their parents, or offer to go along with the class. It is advisable to not to leave the city, you can have a great time in the camp, because there are guys your age, and you smodesh make new friends. The camp will be cheaper, but nevertheless you'll get the same good memories.