A friend of mine did some project work for a company that was planning a theme park (called "Wonder Land") in Nigeria. Their budget was $250 Million. You can probably multiply that by 2 for first-world countries.
How much does it cost to build a theme park?
Millions.
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Eeesh alexia on blurtit at school...naughty girl =)...but it can cost like a few hundred million to build one (a roller coaster can cost like 10/15m to build due to the research and planning beforehand =)