If you're not taking the ferry, and you want some tips for an easier flight...check these out.
Airlines update prices for their online tickets about every 15 minutes. This leaves you a very small window in which to get the best prices. Tuesdays and Thursdays are the best days of the week to buy tickets. Prices will be higher on Friday through Monday.
Make copies of all your important documents before going, from passports to credit cards to itinerary. Then leave copies at home with someone you can contact.
Remember to take all stickers or tags off your luggage from previous trips. This will lessen your bag going to Seattle when you really wanted it to end up with you in Sienna.
Check to see if your airline charges more for checked luggage at the ticket counter than if you checked it online. You can pay for your checked bag 24 hours in advance from home, usually a cheaper cost.