Royal Caribbean When Rhapsody of the Seas departs from Singapore in December, it'll be the biggest ship in Asia. Itineraries--from weekend island hops to 12-night voyages--will include stops in Kuala Lumpur and Phuket. 866/562-7625, royalcaribbean.com, from $299.
Princess Cruises A six-night Thailand and Cambodia land tour has been added to the Bangkok sailings on the 2,670-passenger Sapphire Princess and the Diamond Princess. 800/774-6237, princess.com, from $2,145.
Star Cruises The Asia-Pacificbased operator has a new ship, SuperStar Aquarius, sailing out of Hong Kong, with ports of call in Singapore, Thailand, and Malaysia. At 13 stories, it's the biggest ship based in Hong Kong. 888/666-1888, starcruises.com, from $625.
Crystal Cruises Crystal Serenity will do two-week cruises between Singapore and Hong Kong next spring, with stops in Thailand and Vietnam. 888/722-0021, crystalcruises.com, $6,785.