I hope you have a pleasant journey .

旅途愉快！

I wish you success in/with your studies。

祝你取得好成绩！

Give your mother my best wishes！

请向妈妈转达我最好的祝愿！

All the best in your business！

祝你万事如意！

Every success in your new job！

祝你在新工作中一切成功！

I hope every thing goes well。

希望你一切顺利。

I hope you have a good time.

希望你过得愉快。

I wish happiness to all our friends!

祝诸位朋友幸福愉快!

I hope things are all right with you!

祝你一切顺利!

Wish you to get well soon.

祝你早日康复。

Have a wonderful time on Mid-Autumn Day.

祝中秋快乐!

May you return safe and sound.

祝你平安归来。

May all happiness attend you.

祝你永远幸福。