Hugo Conteras, a shirtless twentysomething, stands on the shore with a long lens, photographing them. Later, he offers to sell them a series of the best shots for about $20. He tells me surfers sometimes ask if he’ll take Bitcoin. He’s taken it on a few occasions, but the dips in price burned him. “Now I tell them it’s $25 if they want to pay in Bitcoin,” he tells me. “You don’t know when it’s going to go down.”