Summer is the season for long days at the beach. But before you hit the sand, it pays off to be prepared and put together a beach kit stocked with all the essentials ahead of time. “All-day beach trips are what many Californians live for,” says pro surfer Demi Boelsterli. “When I head out for a long day of nothing but fun, I want to make sure I have everything I need to avoid an ounce of stress coming my way.” A Santa Barbara local, Boelsterli travels to surf contests around the world. In between events, she spends as much time as possible at the beach. We asked Boelsterli to come up with her list for a perfect day at the beach. Here are 22 things you won’t want to leave behind.