| As Heather said, you can print boarding passes at the airport kiosk (where you'll need to go anyhow if you're checking luggage, because Southwest doesn't participate in the program that allows you to check luggage at a Disney resort).
The advantage to checking in online 24 hours before your flight is that you will be a low boarding number. Southwest does not assign seats; instead, they ask you to line up in groups according to boarding number. So, if you check in early and get a low number, you'll be among the first to board the plane, giving you a wider choice of seats. Each member of your party needs to be checked in separately to get a separate number, but as long as the numbers are within a few of each other, you shouldn't have trouble getting seats together as long as you're in the first few groups.
Have a great trip,
Melissa
__________________ | Planning a Disney Wonder 4-night cruise, January 2010 | |