This challenge is to make a list of experiences you'd like to have before you kick that proverbial bucket and start checking them off. Whether it's skydiving, seeing the Grand Canyon, taking up acting, learning how to sing - take steps now to make these things happen.
One day, we're all going to kick the bucket. It would be a huge shame to realise you've spent a giant chunk of your life doing things you don't care about with people you don't care about in order to get things you don't care about.
Spend some time doing things you've always wanted to do before you come to the end of the road.