The 1070-passenger Crystal Serenity will sail the Northwest Passage again next northern summer. The 32-day voyage leaves Anchorage for New York on August 15. From $28,600 a person, all-inclusive; savings for early and double bookings. Crystal has recently launched Private Jet Global Journeys, a collection of holidays for 15-29 days by private customised Boeing 777. More: crystalcruises.com.