Be sure to drink plenty of water. You'll be outside in the sun most of the day (very few things are indoors in the park), so you don't want to get dehydrated. Also, if you're looking for characters, try Camp Minnie-Mickey. Mickey, Minnie, Goofy, Kenai, Koda, and sometimes a few others are all there. For short lines, go while one of the performances of "Festival of the Lion King" is going (it's right next door to the character pavillions). Because most everyone is in the theater, they characters have little to no crowds around them.