YOU SAID:

Sometimes i ride my horse when the weather is good.

INTO JAPANESE

天気がいいとたまに馬に乗ります。

BACK INTO ENGLISH

I sometimes ride horses when the weather is nice.

INTO JAPANESE

天気がいいときは時々乗馬をします。

BACK INTO ENGLISH

I sometimes go horseback riding when the weather is nice.

INTO JAPANESE

天気がいいとたまに乗馬に行きます。

BACK INTO ENGLISH

When the weather is nice, I sometimes go horseback riding.

INTO JAPANESE

天気がいいときは、時々乗馬に行きます。

BACK INTO ENGLISH

When the weather is nice, I sometimes go horseback riding.