"Later," Tina shouted, over her shoulder. "I'm going to see if there's a sloth.

Ellen Bowman looked around at the beach, and the trees. "You think she's all right?"

"Honey, there's nobody here for miles," Mike said.

"What about snakes?"

"Oh, for God's sake," Mike Bowman said. "There's no snakes on a beach."

"Well, there might be…"

"Honey," he said firmly. "Snakes are cold-blooded. They're reptiles. They can't control their body temperature. It's ninety degrees on that sand. If a snake came out, it'd be cooked. Believe me. There's no snakes on the beach." He watched his daughter scampering down the beach, a dark spot on the white sand. "Let her go. Let her have a good time."

He put his arm around his wife's waist.

Tina ran until she was exhausted, and then she threw herself down on the sand and gleefully rolled to the water's edge. The ocean was warm, and there was hardly any surf at all. She sat for a while, catching her breath, and then she looked back toward her parents and the car, to see how far she had come.

Her mother waved, beckoning her to return. Tina waved back cheerfully, pretending she didn't understand. Tina didn't want to put sunscreen on. And she didn't want to go back and hear her mother talk about losing weight. She wanted to stay right here, and maybe see a sloth.

Tina had seen a sloth two days earlier at the zoo in San Jose. It looked like a Muppets character, and it seemed harmless. In any case, it couldn't move fast; she could easily outrun it.

Now her mother was calling to her, and Tina decided to move out of the sun, back from the water, to the shade of the palm trees. In this part of the beach, the palm trees overhung a gnarled tangle of mangrove roots, which blocked any attempt to penetrate inland. Tina sat in the sand and kicked the dried mangrove leaves. She noticed many bird tracks in the sand. Costa Rica was famous for its birds. The guidebooks said there were three times as many birds in Costa Rica as in all of America and Canada.