I live in north north scottsdlae Fountain hills zip code but scottsdale adress, so techincly fountain hills. But there are about 10-20 of us at my high-school that used to do stuff, we went to MT. ORd a few times, but then half of them went to college.
I had your delema when i was 17, just wait it out another year and much more will become open. But even then you will be hard pressed to find something big that close to scottsdale. Four peaks isnt that far (the conico station at least), and TAC lets people under 18 as long as they have a full face mask and a waiver, just drive down there when they have games.