YOU SAID:

Jump in, the atmosphere is fine

INTO JAPANESE

飛び込んでみると、雰囲気はいい

BACK INTO ENGLISH

When I jumped in, the atmosphere was nice

INTO JAPANESE

飛び込んだ時は雰囲気が良かった

BACK INTO ENGLISH

The atmosphere was good when I jumped in.

INTO JAPANESE

飛び込んだ時の雰囲気は良かったです。

BACK INTO ENGLISH

The atmosphere when I jumped in was good.

INTO JAPANESE

飛び込んだ時の雰囲気は良かったです。

BACK INTO ENGLISH

The atmosphere when I jumped in was good.