This is Ukulele like object with a neck and strings, often decorated with island scenes sound board, and the body apart from the soundboard made from one or more coconut shells. The suggestion is that it's the pre-colonial precursor to the Ukulele, (it isn't!), and a musical instrument, however none of the ones I have seen have been remotely playable or musical and so are only good as a wall hanger. 

Though these can be made in Hawaii, (especially the older ones), these days they are more likely to come from the far east and they are ALL meant only as a souvenir for tourists.