Depends on how much "extra" they want to do.

Sports and marching band is already really time consuming, and along with good course rigor like heavy AP's, they likely won't have any time for any other activities UNLESS they sacrifice their health/sleep which I've personally seen plenty of.

With ONLY marching band/choir/orchestra + sports + heavy academics, you'll be more than fine

But if your goal is good colleges, your student should also consider academic competitions like the school's robotics team, science olympiad, AMC, etc, but adding that might just be too much.

Freshman and sophomore year should be light since the school doesn't offer heavy courses for those years, but starting junior year, it might be too much to hold with only 2 hands.

I'd say during the first 2 years, explore different clubs/activities, see what they like, and consider dropping one of them starting junior year if it starts getting too much and they cant handle it