There are many ways of writing this. What I can suggest is "Have a safe journey full of fun and excitement". You can twist the words to make it better.
How Do I Write 'Have A Safe And Fun Trip'?
Have a safe drive
Since you havent mentioned which language you want to write this phrase in, I am giving you several options in different languages:
In French:
Avoir UN Voyage Sûr Et Amusant
In Spanish:
Tenga un viaje de la caja fuerte y de la diversión
In German
Haben Sie eine Safe- und Spaßreise
In French:
Avoir UN Voyage Sûr Et Amusant
In Spanish:
Tenga un viaje de la caja fuerte y de la diversión
In German
Haben Sie eine Safe- und Spaßreise