You’ve got some awesome ideas of your own and some great suggestions from the coven on top of that! 
I would put another vote for meditation- it can be done anywhere at anytime, requires no items to prepare, and won’t raise too many eyebrows if people come across you while you’re doing it 
There’s also spending time in your Inner Temple- if you haven’t done the practice before, you can use that time to build up and design your inner sacred space. It’s a fun and personal project that you can do 
Good luck- I hope you can find some great ways to spend the time and connect with your practice, @TheMuslimWitch ! 