ハワイの天然記念物・トップ20

It's really steep! Start early in the morning! You need to be sure-footed!

impressive 500-meter-long tunnel in the lava flow

A remarkable natural spectacle, accessible via an easy hike, partly along wooden plank paths. Direct access is prohibited.

Never seen anything like this before

World class, like a moonwalk

This 500-year-old lava tube was created by a river of lava. Nowadays the lava tube is lit for visitors from 8am-8pm, and the National Park Service urges you to be avoid touching the tube's walls and any hanging roots, as they support entire ecosystems of very delicate organisms. Parking around the lava tube is extremely scarce, but you can hike here along the Crater Rim Trail, which offers many more parking opportunities.

Measuring in at almost 500 acres, this state monument produces truly mind-blowing views out across the water and over Waikiki. Unless you are a Hawai'i resident with a Hawai'i ID, you must make reservations to enter the monument, for a small fee: https://gostateparks.hawaii.gov/diamondhead Diamond Head State Monument is only open from 6am-6pm, with the last hike starting at 4pm. Often, going earlier in the day means fewer crowds.

This is not for everyone. It is very hard, and one should be fit to enjoy it. It is not like walking up a hill; on a trail one can choose the length of their step. Walking up railway ties, that is not an option. Walking up requires strength and wind, walking down requires not being exhausted from the walk up, and a pair of very strong knees. Again, this hike is only for the fit.