There is 15,000 square feet of outdoor treatment space at the Mauna Lani Spa. Nine thatched hales (huts) -- two of them large enough for a couples massage and all with outdoor showers - are surrounded by lush tropical landscaping and a fragrance garden scented by gardenia, ginger, pikake, pakalana and a variety of others beautifully scented flowers. Two hales have lava rock soaking tubs for specialty treatments and one features a Vichy shower.

A lava rock sauna (enhanced with aromatherapy), a fragrant herb garden and a relaxation pavillion dot the landscape. Surrounding it all is a simulation of the 16th Century Kaniku lava flow, which provides a stark, moon-like context to the lush tranquility of the spa grounds.