Describe the tone and mood at the beginning of the novel

The tone and mood at the beginning of the novel is full of wonder and the promise of adventure.

He patted the palm trunk softly, and, forced at last to believe in the reality of the island laughed delightedly again and stood on his head. He turned neatly on to his feet, jumped down to the beach, knelt and swept a double armful of sand into a pile against his chest. Then he sat back and looked at the water with bright, excited eyes.