BOAT
1. Mekong river the first job is to get to the river... you would catch a minivan from Chiang Mai it takes about 6 hours or you would alternatively get a van to Chiang Rai.
Stay overnight there and then by Green bus which takes two to three hours and the hotel where you are staying - they're all the same - will fix you up for a van ride to Chiang Khong, which takes 2 hours.
2. So you leave Chiangrai at 6 in the morning and the van will drop you off at the boat 2 hours later, where you meet everyone else... there are about 70 people travelling on the boat.
3. The first day on the boat takes about seven hours and takes you to a place called Pat Bang. You arrive about three to four pm and all the guest house people will be there to meet you.
4. Spend the night at the guest house.
5. Next morning back on the boat for 7 to 8 hours and you arrive at Luang Prabang.
FLIGHT
The alternative is to take a flight from Chiang Mai to Luang Prabang on Laos Airlines. It costs 110 US dollars each way and takes about 1 hour 10 minutes, they provide you with a roll in The Hostess Arms and a coffee.