YOU SAID:
Let's go have fun today
INTO JAPANESE
今日も遊びに行こう
BACK INTO ENGLISH
let's go play today
INTO JAPANESE
今日遊びに行こう
BACK INTO ENGLISH
let's go out today
INTO JAPANESE
今日は出かけよう
BACK INTO ENGLISH
let's go out today
That didn't even make that much sense in English.