write a note on "Happy Isles" as referred in Tennyson's" Ulysses"

The Happy Isles are the Elysian Fields which is where heroes would go after their death. Since this poem reflects Ulysses wish to go from the boredom of Ithaca seeking adventure which would ultimately lead to his death, he believes that the Happy Isles (unlike his own rather boring isle) will be his end after he and his crew complete their final adventure.

Explain the term happy isles.