Visitors And Scenarios In Marine Park Empire

[Lenni]

Hi, i got Marine Park Empire some time ago and i started to play the scenarios but i always have the same problem: visitors are always complaining, especially about lack of food / drinks, although i put a huge lot of food and drink stands and vending machines all around the zoo... It's really annoying! I just don't understand what i'm doing wrong...  
Does anyone have suggestions about where to put food stands and how many of them and what distance between them and basically what kind of "configuration" will make visitors happy?
Does any of you know where i could find examples of "good" MPE zoos for download?
And also, i remember that in Zoo Empire there was a cheat to win the scenarios (Ctrl+W i think) but it doesn't seem to work anymore in MPE... do you know if there is another scenario cheat for MPE?

[kiwibuddy]

The ZE cheats will work for MPE, but when you do the win scenario cheat, the boxes won't get ticked.

[Lenni]

Oh, ok, thanks. And what about the other questions? Do you have tips or strategies to get a well working zoo, where both animals and guests are happy?