Slideshow -- 10 must-see sights on Hawaii's Big Island
Discover the culture, landscape and activities on the largest island in Hawaii, the Big Island
By Helen Racanelli
Is this an ancient stone pit for sacrifices? Or a sun oven for the day's ocean catch? Not exactly. This is the Lava Sauna at Mauna Lani day spa.
The open-air sauna is made of stones and heated entirely by the sun. You're given a pot of black clay to smooth on your skin, and after it has dried a staff member will guide you to a private outdoor shower to rinse it off. The spa offers an array of services including the transformative watsu water massage in a salt-water pool heated by solar panels.