
12 hotels in Hawaii hold Green Key certification. Each one is audited by an outside body, on a schedule it does not set itself.
Wikimedia CommonsHyatt Regency Waikiki Beach Resort and SpaLuxury twin-tower resort overlooking Waikiki Beach. Features upscale guest rooms, an outdoor pool, premium spa services, and a variety of on-site diniIndependently certified
Wikimedia CommonsThe Fairmont Orchid, HawaiiLuxury oceanfront resort on the Kohala Coast, set amidst 32 acres of tropical gardens. Features a private beach lagoon, award-winning spa, world-classIndependently certified
Wikimedia CommonsFairmont Kea Lani, MauiLuxury all-suite and villa resort located on the shores of Wailea, Maui. Offers high-end accommodations, multiple swimming pools, and diverse dining eIndependently certified
Wikimedia CommonsGrand Hyatt Kauai Resort & SpaLuxury beachfront resort in Kauai, featuring classic Hawaiian architecture and lush tropical gardens. Offers a multi-level pool system, saltwater lagoIndependently certified
Wikimedia CommonsRoyal Lahaina ResortClassic Hawaiian resort set on 27 acres of tropical gardens along Kaanapali Beach. Offers comfortable accommodations, multiple swimming pools, and traIndependently certifiedGreen Key audits a hotel against roughly 100 criteria, some mandatory and some scored, covering water and energy use, waste separation, cleaning chemicals, food sourcing and staff training. A hotel applies, documents each criterion, and is then visited on site. Certification runs for one year, so a hotel keeps it only by re-submitting evidence and passing another visit. It is the largest scheme in this catalogue and the one you will meet most often across Europe.
Green Key measures management practice, not carbon. A large hotel with a pool and air conditioning can hold the certificate while using far more energy per guest than an uncertified guesthouse down the road — it is being judged on whether it manages its resources deliberately, not on the size of its footprint. The scoring is also weighted towards documentation, so a hotel with good records can outscore one that quietly does better.