The Tide Rises, The Tide Falls

This is a poem Padme just finished memorizing. She selected it herself.

The tide rises, the tide falls,

The twilight darkens, the curlew calls;

Along the sea-sands damp and brown

The traveler hastens toward the town,

And the tide rises, the tide falls.

Darkness settles on roofs and walls,

But the sea, the sea in darkness calls;

The little waves, with their soft, white hands

Efface the footprints in the sands,

And the tide rises, the tide falls.

The morning breaks; the steeds in their stalls

Stamp and neigh, as the hostler calls;

The day returns, but nevermore

Returns the traveler to the shore.

And the tide rises, the tide falls.

----Henry Wadsworth Longfellow

So who, do you suppose, is the traveler? And where is he going? Why does he never return to the shore?