Ideal for couples, the Retreat Spa offer gives two guests a private changing suite and four extraordinary hours at this subterranean sanctuary. Proceed into a remarkable concourse of lava that encompasses endless possibilities: a sauna, a steam cave, a wood-burning fireplace, a nesting area, a refreshment area, a panoramic viewing deck, a cold plunge well, and the mesmerizing waters of the Retreat Lagoon.  Begin the experience with check-in and a briefing on the spa area and the best way to enjoy the services. You will then be shown to your private changing suite, decked out with a large shower and dry area and equipped with towels, bathrobes, flip-flops, and Blue Lagoon beauty amenities. The best place to start is the Retreat Lagoon, filled with the same blue thermal waters as the regular Blue Lagoon, but without the crowds. Here you can soak and unwind, order a drink of your choice, and take in the serenity.   The Retreat Spa is an indoor sanctuary that takes your relaxation to the next level. There are multiple areas to relax and enjoy the views over the Retreat Lagoon. There is also a sauna, steam cave, and areas to treat your skin with the Blue Lagoon skin care products. The pinnacle of the journey is the Blue Lagoon Ritual — an exhilarating cycle of wellbeing where you commune with the Blue Lagoon's transformative elements: silica, algae, and minerals. Indulge in a full-body, self-applied treatment pampering session with salt scrub, silica mask, algae mask, and nourishing face and body oil. The spa also features a restaurant with menus based on the finest, freshest local ingredients. It is a place of gourmet nourishment with expansive windows revealing marvelous views of the surrounding mineral-rich waterscape and the centuries-old lava. Before, during, or after your spa journey, the restaurant makes for a memorable culinary experience. No reservations are needed.