The Happiness Shrine Puzzle/Task

THE HAPPINESS SHRINE

On Chart 10 we presented the user with a little puzzle to solve. We provided this picture of "The Happiness Shrine", a surprising little monument hiding unobtrusively on a shady shore somewhere on that chart. (We came across this little-known site while researching the chart, and liked it so much we wanted to encourage others to visit it.)
The challenge was in two parts:
(1) find the shrine, and
(2) read and poem inscribed on the shrine, and identify the famous poem (with minor changes) from which it derives.

Scroll down below to view the answers...

THE SOLUTIONS

(1) LOCATION
There are enough clues in the picture that you should be able to find the monument's location with little difficulty. It is to be found on the north shore of Grove Port, the small cove on Grove Penninsula that is home to two fine Mexican restaurants and the Ballerina Pier 59 area.

(2) INSCRIPTION (see picture)
The inscription on the sign is:

Your hours shall be filled with music
and the cares that infest the day
shall vanish as the morning dew
and as silently steal away.

This derives — with some interesting changes — from the last stanza of a famous poem…

And the night shall be filled with music,
And the cares, that infest the day,
Shall fold their tents, like the Arabs,
And as silently steal away.

from The Day Is Done (1845),
-- by Henry Wadsworth Longfellow

If you know the history of the shrine, please tell us about it and we will include the information here.