Various firms make a solid quality of beach tent so that it doesn't fly away. Majority of beach canopies consists of pockets in which you can fill sand or rocks to keep it stable and secure. In case the tent doesn't consist of pockets, then you can secure it to the ground using rocks at the tent legs. Also, if you are taking water for the whole day at the beach, then you can keep gallon milk jugs and join it with the legs.