Formal:
* Até amanhã: (ah-tay ah-mahn-ya) This is the most common and neutral way to say it.
* Vejo você amanhã: (vey-zhoo vo-seh ah-mahn-ya) This literally translates to "I'll see you tomorrow" and is more formal than "Até amanhã."
Informal:
* Até mais: (ah-tay my-ahs) This literally means "until more" and is a casual way to say "see you later." It can be used for tomorrow as well.
* Deu: (day-oo) This is a very informal way to say "see you later" or "see you tomorrow" and is typically used among friends.
* Amanhã: (ah-mahn-ya) This simply means "tomorrow." While not directly translating to "see you tomorrow," it can be used in a situation where you are already planning to see the other person tomorrow.
The best way to choose the appropriate phrase depends on your relationship with the person you are talking to and the context of the situation.