Me personally, I'm taking the 72 all the way up to MLK & Alberta and grabbing the 6 to Vancouver. Getting off at the first Jantzen Beach stop (first one off the freeway), it's right in front of the Safeway. Takes about an hour and a half.
Getting home the exact opposite way on Tuesday morning when I check out.
For those interested in taking trimet: just use their trip planner! It's right on the front page. Set the day and time you want to arrive, put in your starting address, the arrival address (909 N. Hayden Island Drive) and you're good to go.
Kylite, are you sure they have a shuttle from the airport? I heard there was one from the expo center MAX stop, but hadn't heard about the airport one, though it does make sense.
For those of you driving: All you have to do is take I-5 north (from Portland) to the last exit before you go over the river and hit Washington. I believe the exit is "Marine Drive." It's the only way on or off Hayden Island so it's hard to miss.
Same thing for those of you coming from Washington, just the first exit once you're across the bridge and in Oregon.
The hotel will be on the east side of I-5, right on the river.