We were scheduled to have free time too. The missing days in the post were our days off and these were the activities we did:
We did laundry and just did our room cleaning.
Making lesson plan
It was usually done before our teaching practice. We would have one whole day to do it or late at night.
This was the term created by us. It means that we go to mall by mall but not doing the shopping. We only walked around and took some pictures.