There are many STEM activities to try on the NASA website.
Here is the link for the activities for students in Kindergarten to grade 4:
https://www.nasa.gov/stem-at-home-for-students-k-4.html
The cloud mobile and make your own spacecraft look fun!
Here is the link for the activities for students in grade 5-8:
https://www.nasa.gov/stem-at-home-for-students-5-8.html
You could try the build your own moon activity or space origami.