YOU SAID:
I look forward to a shprt but good Day
INTO JAPANESE
私はshprtが良い日を楽しみにしています
BACK INTO ENGLISH
I am looking forward to shprt for a good day
INTO JAPANESE
私は良い一日のためにshprtを楽しみにしています
BACK INTO ENGLISH
I am looking forward to shprt for a good day
That didn't even make that much sense in English.