Consult a weather forecast for Anaheim, California for the days you'll be on your Disneyland vacation to determine how light you'll need to dress in the day and how warm you'll need to be at night.
Pack layers like tank tops, t-shirts and light cardigans that you can pile on in the mornings and shed throughout the day. Even a mild 70-degree day can feel warm while standing in long lines for Disneyland rides. Regardless of how hot it is, however, pack at least one sweatshirt per person so you won't have to buy one if the weather turns chilly while you're watching the fireworks or Fantasmic show at night.
Wear a good pair of tennis or walking shoes above all else. Standing in line for rides, walking from land to land or running around Tom Sawyer's Island will become unbearable if your feet ache or you get a blister.
Bring hats, sunglasses, sunscreen, light snacks, a big tote bag to carry essentials and plenty of film or an extra memory card for your digital camera so you won't have to pay high prices when buying them inside the park.
Prepare activities for the kids like hand-held electronic games, portable music players and magnetic drawing boards or puzzle books to keep them occupied in long lines.
