Looking for recommendations for good value accomodation and activities on a moderate budget. Given the short duration we're thinking of staying on Oahu but also don't really know how easy or hard it is to get to the other islands. The Aussie dollar doesn't convert well unfortunately, so while we're not looking to be complete tight arses it certainly won't be a "money is no object" holiday. We like to have options for things to do (as nice as the beaches are if that's the only thing on offer nearby we'll get bored), and we don't mind walking. Suggestions?