Expanding our horizons is one fairly easy way to change the world. When we increase the range of things that we know about or have experienced, we open up so many new possibilities. Is trying something new every day a pretty tall order? Consider doing it every week with at least one bigger thing every month.
Now to make this work, it might help to write some things down on your calendar. Certainly you can leave some events to chance, but planning ahead will give you a much better chance of success. Begin with events that take place in or near your community such as concerts or parades or fairs. How may of them have you always said "someday I should do that"? Well, why not make the next event your someday?
It's amazing how rewarding it is to broaden your horizons! You don't have to limit yourself to scheduled events too. Go out and try new things like tutoring a student, serving food to the homeless, answering phones at your favorite non-profit, or maybe some daredevil idea like bungee jumping or skydiving. Go on a retreat for a weekend, either with a group, or by yourself. There are so many possibilities! Oh and if you really want to benefit, share your experiences as well!