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It's great to hear that you're interested in photography, and committed enough to make an excel sheet for your parents. In all honesty, if the camp you're going to provides you with cameras, wait to purchase one until after camp. There's no sense in purchasing one, getting there, and finding out you like one that they had there more.
In respect to categories. MP's are the posterchild for brands. 2-3MP will show very little to nothing on a large print, let alone a computer screen. Jumping from 10 to 15 or 20 is a different story. Look into if you're wanting a consumer body, or a prosumer body that will be made of a more durable material and be more okay with dealing with light rain etc. Are you wanting high fps? Things like that.