Be mindful of the sun!
Playing on the beach is the sun is one of the funnest things to do during the summer but don't forget to drink water and wear UV protective clothing.
It is easy to forget to drink liquids when you are so concentrated on your sand art but try to remind yourself every 20 minutes to drink at least a cup of water. If you start to notice the following symptoms you are on the edge of a heatstroke: You have a headache, your body feels very hot, you can't think clearly, you notice you're not sweating anymore, you're nauseous, your breath and heart are going faster.
If you start to notice any of these symptoms take a break from the sun, find some shade or go inside in the AC to cool off for a while and drink plenty of water until you're ready to continue working on your masterpiece.