YOU SAID:

Let's go to Japan and have a great time

INTO JAPANESE

日本に行こうし、素晴らしい時間を過ごす

BACK INTO ENGLISH

Have a great time, and go to Japan

INTO JAPANESE

素晴らしい時間を過ごすし、日本へ行く

BACK INTO ENGLISH

Have a great time and then go to Japan

INTO JAPANESE

素晴らしい時間を持っているし、日本に行く

BACK INTO ENGLISH

Have a great time and then go to Japan