San Diego is one of the best domestic beach vacations. The weather is likely to be mild and sunny regardless of the season you visit during. San Diego is a foodie haven, beach city, has great shopping, the world’s best zoo (in my opinion), and museums. Below is guide to packing for San Diego. Don’t forget the basics like pajamas and undergarments. If you plan on having a beach side bonfire I suggest packing a sweatshirt and maybe leggings since the beach can get a little chili at night.