This is a must feature for this game.
There needs to be a sandbox mode where unlimited money can be disabled and you choose a difficulty level, starting with different amounts of money for each difficulty, and make each difficulty have it's own dynamics that make it more or less difficult. Like the SimCity games. If you mess up real bad, the park faces inevitable bankruptcy after going in debt to far, and it collapses. That way, sandbox mode can actually have a limit and ending if you totally screw up.
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Keep the unlimited money as an option too!