noun
paradise; heaven on earth
Refers to an ideal, blissful place or state, often used figuratively for a place of great enjoyment or comfort.
このビーチはまさに楽天地だ。
This beach is truly a paradise.
子供たちにとって遊園地は楽天地のような場所だ。
For children, an amusement park is like a paradise.
天国 means 'heaven' in a religious or afterlife sense, whereas 楽天地 is typically used for an earthly paradise or ideal place.
Compound of 楽 (らく, 'comfort, ease') + 天地 (てんち, 'heaven and earth'), literally 'a world of ease'. The exact historical derivation is uncertain, but the word is conventionally associated with the idea of a blissful realm.