Braids like these are best done on a tropical beach. These were created on the beach in Mexico.

By keeping your hair from blowing in the wind, they will save you from split ends. With simple maintenance it can last for weeks and will remain stylish both in and out of the ocean.

Shampoo gently; you can even use conditioner. Rinse well and pat it dry.
As a precaution: Be sure to use sunscreen between the braids!