Plenty of our favorite hotels have yachts available for day trips and sunset sailings. But a few now offer overnight stays featuring the same high-end design, service and amenities as their terrestrial counterparts. These multiday sailings are more common at island retreats — especially in the Asian archipelagos — where a private boat is the best way to experience the watery surroundings. The impressive hotel yachts collected here offer exclusivity and privacy, bringing passengers on adventures to secret islands, secluded coves and hidden reefs known only to locals and the most experienced of yachtsmen.

Maldives: The Nautilus

We recently returned from a splendid stay at this private island resort, where we admired its 26 chic beach houses and overwater villas, all with pools. Its four restaurants are open around the clock, and the glass-floored spa-treatment bungalows wowed us. An overnight excursion on one of the hotel’s boats only adds to the appeal. The two plush Princess motor yachts — the 64-foot, three-cabin Tranquility and the 54-foot two-cabin Nautilus One — make it a dream to explore the resort’s setting in the UNESCO-recognized Baa Atoll Biosphere Reserve, which is celebrated for its abundant sea life and coral reefs. Between Champagne breakfasts and gourmet dinners, guests can spot dolphins, swim with manta rays and whale sharks or enjoy a treatment from the onboard spa therapist.

Thailand: Four Seasons Resort Koh Samui

This luxury resort on the Thai island of Koh Samui — known for its sandy beaches, tropical forests and pristine waters — offers an unforgettable seaborne home-away-from-hotel experience. Its 60-foot Sunseeker motor yacht, Minor Affair, plies the waters around the Gulf of Thailand’s Mu Ko Ang Thong Marine National Park, bringing you to hidden snorkeling, diving and beach sites among the preserve’s 40-plus limestone islands and turquoise lagoons. An overnight voyage — it has three double staterooms — offers myriad adventures, such as swimming among parrotfish and stingrays in coral reefs and hiking through jungled landscapes. The onboard picnic lunches and breakfasts are lovely, but even more enticing are the cocktails, bonfire and chef-prepared barbecue dinner on a secluded private beach.