The DLNR has just recently changed the rule concerning when camping permits are needed when hiking the Kalalau Trail. You used to be able to hike to Hanakoa and back without a permit. The new rule states that you need a permit to hike past Hanakāpīʻai Valley. Their announcement cited illegal campers as the reason for the change. Those who are caught illegally on the trail may be cited and those cited will have to appear in court on a petty misdemeanor charge.
This is a pretty major change since many hikers who were not able to get permits often desire to hike to Hanakoa and back in order to see as much of the Kalalau Trail as possible without a permit.
You will still be able to hike to Hanakāpīʻai Beach (2 miles, 4 miles round trip) and up to the falls (4 miles from the trailhead, 8 miles round trip) without a permit as a day hike.