I'm lining up a few days in Honolulu next month. While there are things on that island that I want to see (Pearl Harbour etc), I'd really love to get to Mauna Kea as well.
Wikitravel's Honololu article doesn't really explain much about getting to other islands, however.
What's the easiest and cheapest backpacker-style way to change islands. I assume helicopters are options, but there must be a cheaper way?