Since the "you" is dropped in the Italian translation, could this also be a command? Like, "Come to the zoo"?
i think it is plural, the correct is may be: "you all come to the zoo"
yes it could, both answers are correct
It sounds like she's asking a question. Do these things ask questions?
I answer 'are you coming to the zoo' and it was incorrect. why?
No question mark.
i'm also wondering if this couldn't be an imperative? Or if in Italian it seems more likely imperative or declarative.
Yup, I agree. It's the imperative.
how would you say "you go to the zoo"? I keep thinking vado and va mean go, rather than come.
You are right: vado and va are forms of the verb andare - to go, but venite is the 2nd plural of the verb venire - to come. 2nd plural of andare is andate.