Aloha!
Diamond Head is the most popular Hawaii State Park
It takes about 1.5 - 2 hours to hike Diamond Head

Refer the link below ;
Department of Land and Natural Resources Division of State Parks
[ Ссылка ]
"As of May 12th, 2022 all out-of-state visitors must have an advanced reservation to enter Diamond Head State Monument. The reservation system will activate on April 28th, 2022 allowing for reservations to be made 14 days in advance"

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