Be it a letter, postcard, gift or whatever you think they would put a smile on their face. It doesn't have to be something expensive, the simplest things can be the most meaningful things in life.
You get to do what you enjoy which is sending mail but the bonus is the mail you send will uplift the spirits of a sick and poorly child. How amazing is that?
I think it is a really worthwhile cause and will definitely be participating and I hope that some of you will join me.
Here's a link to the site: http://postpals.co.uk/