Just What We Need: I spent many a hour at the (im)famous Mall of America while I was in college at Macalester. Triple Five of Minnesota Inc. plans to double the size of the Mall of America, the largest US shopping center, at a cost of more than $1 billion. The plans, presented to city officials in Bloomington, Minn., where the 520-store mall is located, include the addition of a casino, department stores, boutiques, and restaurants, closely held Triple Five said in a statement. Included in the expansion will be a hotel with themed rooms including an igloo room and a Hawaiian room; a concert center; a hockey rink for public skating and ice shows; and a canal with gondolas surrounded by dancing fountains, Triple Five said.