Book a flight to New Zealand, buy a pair of inline skates and ride across it's length (2000+km) with those blades.
This has been done only twice in the past (and one of those was mixed with hitchhiking), and never in order to raise funds for charities.
But in French we say "never two without three". so this blog describes the kiwi adventures of a Belgian traveler on his inline skates.
Just him, his skates, his trailer, a big goal and his HUGE determination to succeed it.