The sales tax free Mall of America (MOA) is easily accessed from either MSP terminal via the light rail. Expand your dining options, do some shopping, or add a roller coaster to your layover. I would not suggest making the trip unless you have at least a 2 hour layover. Trains run approximately every 10 minutes and take 12 minutes from Terminal 1 (Lindbergh DL/AA/UA), 10 from Terminal 2 (Humphrey WN/FL/SY). The fare is $2.25 during peak hours and $1.75 off peak and weekends. Vending machines are available at all stations and take cash or credit cards. The ticket is valid for 2 1/2 hours from the time of purchase which will be printed on the ticket. If making a short trip you can get away with only purchasing one fare as the outbound will still be valid for the return. A city bus, #54, also makes the trip at the same price and similar ride time. This only stops at Terminal 1 and is a much less pleasant experience. The light rail station is under Terminal 1. If you arrive in concourses D, E,F, and lower numbered G gates the fastest route is via baggage claim, follow the signs. For A,B,C, and high G gates the fastest route is via the exit on the concourse connector bridge between C and G then go down 3 levels. If you need a miles fix or a promotion activity, SuperShuttle will also make the trip for under $10 each way.