Check in on locations and make sure the staff knows and practices the company values.
Offer benefits to your student workers. These people stay late to help make sure your store is immaculate for opening the next day. A lot of that work is rushed because typically managers don't want to spend too much for overtime. Make sure your employees, part time and full, have some benefits, like health or dental, and make sure they are aware of these benefits. If you added that, it would make an already wonderful workplace perfect. Seriously, I miss this job.