When visiting Disneyland, there are certain guidelines and restrictions to ensure the safety and enjoyment of all guests. As for what is allowed, guests are welcome to bring personal items such as backpacks, strollers, and snacks for individual consumption. However, there are also items not allowed, including weapons, drones, glass containers, and any objects that may obstruct the view of others during parades or shows. Additionally, costumes for guests ages 14 and older are generally not permitted, unless it's during special events like Mickey's Halloween Party. Disneyland has a comprehensive list of guidelines on its website to help guests plan accordingly and ensure a pleasant experience for everyone.