YOU SAID:

today is a good day for riding a bike

INTO JAPANESE

今日は自転車に乗っての良い日です。

BACK INTO ENGLISH

This is a bike ride today was a good day.

INTO JAPANESE

これは自転車に乗って、今日は良い日だった。

BACK INTO ENGLISH

Riding this bike, today was a good day.

INTO JAPANESE

この自転車に乗って、今日は良い一日だった。

BACK INTO ENGLISH

Riding this bike, today was a good day.