Is there any recommended books on grammar or anything? What would be your recommended way of studying this language?
I have 'Hawaiian Grammar' by Elbert & Pukui (ISBN 082482489X). It is a scholarly reference grammar that is highly praised. I can't honestly rave about, but it isn't horrible, either. It is the only such grammar I have seen for Hawaiian (Not that I've done that deep of a search). I prefer it to Elbert's dictionary, which I find annoyingly hard to use. For a textbook, I like 'Ka Lei Ha'aheo: Beginning Hawaiian' by Hopkins (ISBN 082481259X). The Duolingo course is okay, but very skimpy & there isn't much in the way of audio yet.
That is true. I wish they added more audio. Thanks for your suggestion I will look for them on Amazon.
Audio CD: Instant Immersion Hawaiian by Topics Entertainment. GO to ʻŌlelo Online for the CD's text.
New Pocket Hawaiian Dictionary by Mary Kawena Pukui and Samuel Elbert.