Free entry: Hawaiʻi residents enter free with a Hawaiʻi driver’s license or state ID. Children age 3 and under enter free. Resident private-vehicle parking is also free with Hawaiʻi ID or driver’s license.
Sold out? No day-use ticket inventory, timed-entry reservation, lottery, or official resale market exists. Drive in during daylight hours, pay the applicable entry and parking fees, and check DLNR’s park page immediately before leaving for storm-related closures or reduced services.