Final answer:
The words that convey a whimsical, lighthearted tone are soft, light, and fair.
Step-by-step explanation:
The words from the excerpt that best convey a whimsical, lighthearted tone are soft, light, and fair. These words evoke a sense of gentle and pleasant imagery. They also suggest a cheerful and carefree atmosphere, which is characteristic of a whimsical and lighthearted tone.