The Road to Hana

When the sea is ferocious, on the early part of the Piʻilani Trail and just north of Pa'iloa Beach you'll find this dramatic blowhole (it's signposted). Connected to a submerged cave, it violently spews water out of the precipice up to around 15ft during its mightiest roars – you'd best be standing back when it does. However, it's not an everyday event; keep an eye on local swell charts or surf reports if you're hoping to see it in action.