One can wear a hijab and decorate it with a side flower or clips. A very wide headband is also a nice idea. However like most accessories this is going to protect your top head area only.The rest will still be exposed to the sun.
However to protect the rest of the hair you will need to pull it up in a cute bun. making sure that a hat would fit. Therefore, Most importantly you need to take your time and experiment with a bit of hairstyles and accessories.
Its important to decorate with something to protect yourself from the sun. Although it’s vitamins are very healthy it’s rays may be very damaging. Therefore it’s highly recommended to were sun visor hairstyles or hair accessories. Especially if you live in very hot countries.