Advice for surviving the summer when I have an early bedtime?

I'm a girl and in high school. Most of my friends can stay up as late as they want in the summer. But mom told me I am going to still have an early bedtime of 7:30! It's not even dark out at that time but she won't change her mind. Any advice on how I can survive the summer even though I have to be in bed by 7:30?