From what viewpoint does the poet observe nature in "I Wandered Lonely as a Cloud"?

William Wordsworth's "I Wandered Lonely as a Cloud" is a poem told in retrospect. The narrator describes a past experience of walking across hills and through valleys until eventually coming upon a "host, of golden daffodils" (4). The narrator recollects stopping to observe the slight, happy movements of the flowers in the breeze—comparing their number to that of the twinkling stars in the sky. Even the movement of the sea cannot match that of the daffodils.
The experience leaves the narrator in awe, as they state "I gazed—and gazed—but little thought / What wealth the show to me had brought" (17–18). This is one of the clearest indications that the narrator is reflecting upon the event. At the time it occurred, they didn't realize the "wealth" that the experience had provided them. Rather, they were simply captivated with the sheer number of moving daffodils.
However, the last stanza shows that a decent amount of time has elapsed since the events of the poem took place:

For oft, when on my couch I lie
In vacant or in pensive mood,
They flash upon that inward eye
Which is the bliss of solitude;
And then my heart with pleasure fills,
And dances with the daffodils. (19–24)

The narrator has since had time to process the event and understand its true value. Recalling the experience has become the means by which the narrator lifts their spirits to a level that matches that of the dancing daffodils of long ago. Therefore, nature is being viewed from two viewpoints: the initial viewpoint of the experience itself, as well as the recollection of the experience that the narrator returns to, time and time again.