Getting a letter
... that's the best bit. Somehow getting real letters is better than an email.
I helped out a local school teaching robotics half a day a week for a few months. It was great watching the kids figuring stuff out and learning.
There are clearly some that have a natural affinity for exploring and experimenting and then some who will grow up thinking that using LOL or #tags makes them "tech savvy".
It was certainly rewarding to work with kids who are keen. I recommend the experience thoroughly even if you have to do it on your own time like I did.