YOU SAID:

dont have too much fun

INTO JAPANESE

あまり楽しくない

BACK INTO ENGLISH

Not much fun.

INTO JAPANESE

あまり楽しくない。

BACK INTO ENGLISH

It's not very fun.

INTO JAPANESE

それはあまり楽しいことではありません。

BACK INTO ENGLISH

It is not so much fun.

INTO JAPANESE

それほど楽しいことではありません。

BACK INTO ENGLISH

It's not that much fun.

INTO JAPANESE

そんなに楽しくない。

BACK INTO ENGLISH

It's not that much fun.