When you first start a Theme Park put a huge path to the left or right of the entrance.
Build many shops and restrooms on that path(I suggest putting a trash can by all food and drink shops or your janitors will have a lot of trash to clean up).
Than connect a bunch of ride lines and exits to that path and watch the visitors pour into the rides and after they ride they will go into the shops and spend lots of $$$$$$$$$$$$$$.
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