Well the obvious answer would be Equestria. Cause you know ponies and shiz.
My second option would be Onyx in the Halo universe:
Cause, according to the books, Halsey and the other Spartan 2's and 3's are there.
My other option would be Gielinor, the Runescape universe.
Train up to be the greatest adventurer of all time. Would be glorious.