Mahalo nui to Lauren Tanaka, Luciano Minerbi and the students who assisted with this.
Some quick document links, for handy reference:
Act 5, 1987 Outline (pdf) — easy to understand! This is the 1987 legislation that established Kahana Valley as a cultural living park.
Act 15, 2009 Outline (pdf) — Easy to understand outline of Act 15, which put a temporary halt on evictions and required that a Master Plan for Kahana be created. Formed the Kahana Planning Council. The full text of Act 15 can be found here.