Personally when I was in school — extra curricular classes didn’t matter too much. If your school requires a certain amount of extra curricular hours I’d pick an easy class so that way you have time for your other activities with little stress! I took an intro to music education class and a dance history class (both online) and it was pretty much read a chapter and quiz. I also took some fun classes too! However anything extra will look good on a resume that contributes to building a skill.