"We want you to use the week to think about – and do – what makes you and others feel Good. And if you’re already doing Good in your life then even better, just get involved and tell us about it. Use the week as an opportunity to shout about what you or your organisation is doing".
Their website has suggestions and a downloadable toolkit for how you can get involved but it's really down to you and what you judge as being something that makes you Feel / Do / Live Good. There are also a number of fun and inspiring events you can attend as a way of participating and enjoying A Good Week.
A small gesture is just as effective as something more complex. Look around you, the people you come into daily contact with, the places you spend your time and see if there's something you can do to generate a bit of good feeling. It's often mentioned that doing good for others makes you feel good in return so try it and see for yourself!
Let me know if there's something 'good' you do in particular this week or if you have some ideas of what you might do. Have A Good Week!