See Heart Rock too:
Although the rounded edges of this rock cavity seem almost too symmetrical to be natural, this heart-shaped window was created by Mother Nature. Pounding surf naturally eroded the lava rock shelf, eventually wearing it away until a perfect heart was formed… which means someday the ocean will force it into a new shape, so take in the views while you can. Adjacent to the Nakalele Blowhole, the hike to this natural wonder is no easy feat -- covered shoes are recommended when scaling the rocky slope, and please heed the hand-painted warning signs, and don’t stand too close to the geyser. Seriously, you wouldn’t want to get swept away in all the excitement and get, well, swept away.