File this one in your drawer of amazingly cool things to do. The Postie Bike Challenge has been around since 2002 and is more about attitude and an overall experience than high speeds and quick finishes. This 4,000km, 10-day trek through the flatlands and rain forests of Australia is completely different from any motorcycle get-together on the planet. Designed to stimulate more camaraderie than competition, the Challenge puts all riders on the same 110cc bikes, which, to quote the creators, “is the great equalizer regardless of your skill level.” Oh, and did we mention that the entry fees go to local charities? Check out more information for the next Postie Bike Challenge for October this year at the official website.