ALOHA FROM JENNIE: Starting in Philadelphia in the 60's and flourishing in New York City during the early 70s, urban art meant spray painted 'graffiti' covering subway trains and building walls. In present day Honolulu, there are pockets of wall art and murals painted on the sides of buildings, but in a way that reflects the Hawaiian environment, as shown in the above images (click on the photos to see enlarged detailing). The organized wall mural painting efforts are detailed in an article linked here.
Hawaii's most prominent wall art pieces include the marine murals created by artist Robert Wyland. These beautiful 'whaling walls' are located through the islands of Oahu, Kauai, and Maui. Images of the life size whale depictions throughout the world appear on the Wyland Foundation's website linked here. Hawaii's walls are identified as WW 06, 09, 15, 28, 29, 30, 67, 83, 85 and 89. Hope that this gives you a colorful glimpse into another aspect of art.