I'm not one for playing out scenarios/challenges but I certainly wouldn't turn my nose up at a good ol' murder mystery... ie: Who killed Guidry? Was it Colonel Mustard in the library with the candlestick? :D
Or how about a scavenger hunt or an easter egg hunt (limited time scenario)? Your sim has to travel around to all the different worlds/neighbourhoods trying to find as many 'eggs' as possible. The more you find, the bigger the prize. But you only have a certain timeframe to find as many as possible before time runs out.
