Where to put magnet programs in Common App?

I auditioned and was accepted to a special music/arts magnet/program for my freshman year of HS. This entailed taking upper level music courses and performing at special events. I also applied to and was accepted to an AP scholars magnet, which basically gave me access to extra classes/support (also in freshman year HS). It was like an honors program. Should these go in the honors section, or activities? I’m thinking activities.

Also, I competed but didn’t place in a computer programming competition junior year. I did get a certificate of accomplishment/participation. Is this worth putting on my App?

Thanks!!