I'm sure many people have heard of the Mall of America - the largest indoor mall in the country. Yep - that's about it. All the stores you all have in your cities with the same merchandise you can get anywhere.
Unique Suggestions: The amusement park in the middle is possibly worth seeing, especially if you have kids (or are one at heart).
Although the Mall of America is promoted as a major touristic attraction, it will remain a mall forever. If you are an addicted shopper, this is the place to visit.
Unique Suggestions: If you are accompanied by children (under 14), then visit Camp Snoopy.
Fun Alternatives: Take a bus to St-Paul and visit the Cathedral.