I honestly would enjoy an amusement park expansion pack. Merry-Go-Round, Tower of Terror (fear buff, anyone?), elephant ears (call them "Llama Ears" — they're just cinnamon dough), go-karts (cars, anyone?) and the whole shebang. I think the upcoming "Star Wars" game pack could be a welcome opportunity for an amusement park pack (and with a Disney parody, to boot... the mascot could be a llama instead of a mouse).
I do like your suggestions for the arcade items... We need pool tables / billiards, more old-school arcade machines — and mini golf would be AMAZING!