YOU SAID:

i went to the park it was nice because it was raining

INTO JAPANESE

雨が降っていたので公園に行ってよかった

BACK INTO ENGLISH

It was raining, so I'm glad I went to the park

INTO JAPANESE

雨が降っていたので、公園に行ってよかったです

BACK INTO ENGLISH

It was raining, so I'm glad I went to the park