Trouble with "Tomorrow's Tycoon".

I'm trying to complete "Tomorrow's Tycoon" in Thrillville Explorer. How do I increase the parks value? It says to buld more rides to increase the park value. I have 2 pre-built roller coasters in each section, along with every possible carnival ride (I had to sacrifice most games to do this). I still can't get my park value over 15,000. Any ideas how I can do this?
 
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