During battle, press right, right, left, left, up, down, up, down, right, left to remove Vyse's goggle. It will only be removed for the duration of the battle.
Start a new game and pass the part with Alfonso's ship, then go back to your island. Leave the underground base of Pirate Isle. Aika will say that she needs to freshen up a bit. Go to her house, then face towards the door. Go all the way to the left until you see a clothesline. In that corner you'll see - pasted on the wall of that house corner - a handkerchief. Inspect the handkerchief and you will see a hidden FMV sequence of how Aika looks with her hair down.
Demo Debug Menu (Official Dreamcast Magazine demo)
Description
At the game select screen, highlight Skies of Arcadia. While holding both triggers down, press start twice - DO NOT let up on the triggers. Let the demo load up while still holding down the triggers. At the seizure warning screen, (still holding triggers) hit start and then the A button two or three times. You can now let up on the triggers. You should now be at a screen that says CESA ROM Aug 8, 2000 10:13:12 and it will have a bunch of japanese text in a menu. Selecting the first set of japanese characters will take you into a screen that has japanese text on the very top, and the word scene followed by the number 103a. You can adjust the numbers by using the triggers and dpad. Left trigger increases the hundreds, right trig decreases the hundreds, with five being the highest available number. Up and down on the dpad adjust the tens and ones values, left right adjusts the letters from a to z.
After you have your ship upgraded to fly very high/low, you can avoid battles on your ship by simply going high above/below the clouds. You may then travel anywhere on the map without battling enemies every 10 seconds.*NOTE: This applies to battle on the Deck of your ship, not Ship to Ship battles.*