First of all thank you both very much for your compliments which make me very happy.
I confirm Urufu's answer: opening the zoo to the public will slow down the game for my computer. Then, in sandbox mode, everything is free so no need for money.
And indeed, visitors hamper construction, especially when you change your mind and change an area. I would add that the paths being the most delicate elements to place, we will do without cluttering them with visitors on them.
I will open my park one of these days to take qq photos with visitors but I will limit their number (2000 people for example)
Sorry for my English, I hope my words are understandable with Google translator

I respect the tradition: 100% French so not very good at foreign languages


