Hi,
I'd like to island hop hawaii with flights as follows:

BigIsland -> Honolulu (3-4 days) -> Maui, oneway. Or,
BigIsland -> Maui (3-4 days) -> Honolulu, oneway.

Or any other permutation similar to above.

Point-to-point flights would cost me approximately $70-$100 x 2 x 2 people = $350-400ish.

I'm wondering if there is any mileage plan to optimize above with the layover on single one-way?

I have ample miles across various major US programs, but not Hawaiian Airlines miles. Even have Amex to transfer to Hawaiian if needed (although I was hoping to transfer those to Avios with the bonus). And looking at Hawaiian airlines credit card that has a $89 annual fee so not sure if its worth it right now for me to apply when there's so many other better credit card offers around.

If nothing seems like a good redemption I'll just pay cash for it I guess.

Thanks.