Hello Katie,
I was thinking of coding activities as well in conjunction with other optional lessons. Maybe if you have "stations" or "choice" activities, students can rotate and choose what they would like to work on that particular day. There are many online activities that are specific to certain subjects or interests. The only thing you would need to be aware of for all of this is parent permission or log in information that might be required (due to the new law).
If you're a Google school, you can have students use certain apps to help them create things, (Google drawings, templates, slides, etc). Also
Classcraft might be a good option depending on grade. If you're interested, I can try to send you some resources to look into. I hope this helps.