Monterrey Bay Aquarium has an online daily mindfulness activity while watching one of their beautiful tanks of sea animals:
http://links.mbayaq.org/a/1321/preview/3239/190749/890877caa8582fc0ee8c50115cfd54b67c7d520c
Here is an at-home mindfulness program just for teens:
http://mindfulnessforteens.com/
Deep breathing:
Free mindfulness exercises:
http://www.freemindfulness.org/
Calm
Headspace
Stop, Breathe & Think
Unplug
-Amit Ray