I think the amusement park idea is perfect for story gameplay and it's definitely something we haven't seen before. The Sims 3 store pack with the boardwalk park doesn't count in my opinion since it wasn't really an expansion :p
Found a disc of the game at a thrift store maybe 10 years ago...I really regret not picking it up then because it's really hard to find where I am. Some people consider it "abandonware" because you can't obtain a new copy anymore, so I think it would be really cool if they'd release it for free on the 20th anniversary next…