I think vada allo zoo should be allowed here? If I was telling an Italian whom I did not know to go to the zoo and I did not wish to be rude or overly familar how would I ask it?
vada allo zoo
secondo me, "vai allo zoo!", "vada allo zoo!", "andate allo zoo!" all should be accepted.
vado allo zoo works for me
"Vado allo zoo" should not be accepted as it is first person singular and this is asking for a command.
Yeah - they fixed it. They usually do, though can take some time