fun park noun

An outdoor place of entertainment with various amusements

fun run noun

A long-distance race, not usu covering the full distance of a marathon, undertaken for amusement, or for charitable fund-raising, rather than serious athletic competition

fun runner noun

all the fun of the fair

All the amusements of the occasion

be great fun

To be very amusing

fun and games

1. Amusement
2. Excitement
3. Trouble (facetious)

in fun

As a joke, not seriously

like fun (informal)

1. Rapidly or frenziedly
2. Not at all

make fun of or poke fun at

To ridicule