It would be good to start with a good and balanced breakfast! This could be a cheese and turkey toast with 1 fruit or a yogurt / milk / kefir with cereal or a bun.
On the beach you need enough hydration and protection from the harmful effects of the sun! Do not forget that sun protection is not only in your sunscreen but starts from within you. Fruits provide your body with a number of antioxidant vitamins that are a shield against free radicals created by sun exposure. It is important to understand that even the elasticity of the skin starts with the diet because the well-known collagen that you have heard contain infinite beauty products, is synthesized by your body. Collagen is made by your body and its base is vitamin C. So the consumption of fruits and natural juices, in addition to protecting you, also beautifies you.