Answer:
The answer is indeed the first option: quietness and isolation are tempting.
Explanation:
In Frost's "Stopping by Woods on a Snowy Evening", the speaker longs for some rest. He/she wishes to watch the "woods fill up with snow", that is, to quietly rest from a busy life, doing nothing while the world goes on spinning, while the snow keeps on falling.
However, even though stopping and resting in isolation is a tempting wish, the speaker acknowledges he/she cannot do so. At least, not yet, because "I have promises to keep / And miles to go before I sleep."
