I would of course keep an eye on the weather reports for Anaheim as it gets less than 2 weeks before your trip. I would pack layers- sweatshirts or jackets (with hoods in case of rain), shorts or jeans with t-shirts. It will be chilly in the morning and evening and probably mild to warm in the afternoon. I go every year at the end of April and I pack long sleeves for the morning and night, t-shirts or tanks for the afternoon that I wear under the long sleeved (I wear a backpack to toss the sweatshirt), shorts or cropped leggings, and I wear either Toms or Sanuk sandals. I pack a poncho for the occasional rainy day that I may or may not expect.