Could I pull off wearing shorts without my parents knowing?

okay so my twin sister and I wanna wear shorts to an amusement park. I want to wear them because I think they are soo cute and my legs are really fit and I have no cellulite etc. However, my parents don't like me wearing shorts because they think guys will look at me or whatever. So since ONLY me and my sister get dropped off to the park, we we were thinking of going the the washroom and just changing into shorts and then when my mom picks us up we just change back. Only me and my sister have passes so they have no way of coming in the park. So..should I do it? Does it seem like a decent way? Is there something else I should do? I'm 15 by the way.