Wishing you a wonderful day!

即係祝你有一個"極好的" "愉快的 " 一天 = Have a nice day 一樣 ....

Instead of Goodbye, people will say:
Wish you a wonderful day!
Have a nice day!
Have a nice trip!
See you!
So long!

In old day, people believe that saying goodbye may mean that they will never see each other again, so they will say some good wish to the other.

Wishing you a wonderful day! =I hope you will have a nice day!