In this sentence, we would be understanding the subject verb agreement. The subjects of this sentence did not visit the national park last month which means animals and zoo is not of their liking. This proves that the option should be in negative sense. The words "don't" and "doesn't" are negative words. The words “do” and “does” mean the same, that is, “to carry out or to perform an action". “Do” is used when referring to two or more persons or things while “does” is used when referring to a single person or thing.
This sentence has two persons thus don't is the correct option.