Let's start with the grades part. Honestly, I think that your actual grades don't matter. As long as you are doing your best thats all that matters. From personal experience, I am making A's and B's right now. But it isn't because I am "intelligent" (sorry to use the dreadful word), it is because I study a lot. Just from that, I feel accomplished (and that feels good). This also ties into a growth mindset. If the ideal student gets a sub-par grade, that does not stop them. That just inspires them to do better next time.
Extra curricular activities are great. But they don't necessarily have to be on campus. To me, extra curricular activities are things that you enjoy doing (things that are healthy of course). Go for a jog, have a pizza with friends, go see a good movie. The ideal student balances studying with mind-relaxing activities. This prevents he/she from going completely insane.
The ideal student doesn't worry about how to make a creative attention getter or Marita's bargain, the ideal student ponders about how continuing their education and making right decisions will impact their future. The ideal student wants to make a positive impact on the world. I found this quote that kind of ties in with this topic. Mahatma Gandhi said, "Be the change you want to see in the world." This is the ideal student.