There are many awesome Asian cruises, including river cruises. Just depends on how many days you want to travel, where you want to go, and what you want to see.
We recently did a 17-night cruise from Hong Kong to Beijing that was wonderful!
Contact your travel agent, preferably a cruise specialist, and they will be able to help you narrow down the multitude of choices and options.
__________________ 46 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!