Alli know it has a fast boat three days a week not every day .

we operator Mekong Cruise Tours from Jinghong Yunnan to Golden Triangle and other destinations in Southeast, such as Laos, Luang Brabang, and so on, our website might a help to your trip. by the way, winter is low water level season, the cruise won't be available. but you can take a bus ride from Kunming or in Xishuangbana to those countries. it is cheaper though.

http:www.12visitchina.com

what about driving from kunming to chiangmai?