It would help if you mentioned what sites you've been to. There are a number of guitar sites like Chordie, AZ Chords, Ultimate Guitar and Tab Crawler and from the songs I've looked at, most have been fairly accurate. Most of these sites are categorized by song and artist, not genre. TSH as stated above has the most Hawaiian (contemporary & traditional) songs listed. There is one other site called Hawaiian Music Archives that has only lyrics to traditional music.