General "enjoy":
* Aproveite! (Most common and versatile)
* Divirta-se! (More formal, often used for entertainment/fun)
Enjoy your meal:
* Bom apetite! (Formal and common)
* Aproveite a comida! (More casual)
Enjoy your time:
* Aproveite o tempo!
* Aproveite o momento!
Enjoy yourself:
* Aproveite!
* Divirta-se!
* Passe bem! (More formal and less common)
Enjoy the moment:
* Aproveite o momento!
* Curta o momento! (More casual)
Remember that "Aproveitar" is a verb meaning "to enjoy" or "to take advantage of." So, "Aproveite!" is literally "Enjoy!"
The choice of which phrase to use depends on the specific situation and formality level.