If our students are teens an activity we could implement with them is visiting the poor.
We did this activity in the school where I taught in Jaén: we went to some poor suburb. And it turned out ok and was very educative for the kids, and at the same time we made a favor to some family.
Sometimes we took an inexpensive present to them too. Also the feedback we had about our students was that they learned to value the things they had.
As well we tried to comfort the poor people and entertained them for example if some kid knew how to play the guitar. Alike we listened to the answers they gave to our questions about their circumstances. It was nice. / Photo from: catholic-link com