Formal:
* Mwynhewch eich bywyd: This is the most literal translation and is appropriate for formal situations.
* Byddwch yn hapus: This means "be happy" and is a more general way of wishing someone well.
Informal:
* Mwynha'r bywyd! This is a more casual way of saying "enjoy life!"
* Byddwch yn dda! This means "be well" and is a more general greeting that can be used in many situations.
Other options:
* Cewch chi fwynhau eich bywyd! This means "may you enjoy your life!" and is a more formal way of wishing someone well.
Ultimately, the best way to say "enjoy your life" in Welsh depends on the specific context and your relationship with the person you're speaking to.