How to render 'Fun is Good' -Dr. Seuss in Latin?

You could well say gaudium tibi bono est, "fun is good for you".

1. What is the word for fun in Latin?
2. What is unique in Latin?

What is the word for fun in Latin?

Otium, a Latin abstract term, has a variety of meanings, including leisure time in which a person can enjoy eating, playing, relaxing, contemplation and academic endeavors.

What is unique in Latin?

unique (adj.)

c. 1600, "single, solitary," from French unique (16c.), from Latin unicus "only, single, sole, alone of its kind," from unus "one" (from PIE root *oi-no- "one, unique").