Arlanda has nothing to offer a tourist, unless you have plenty of time and the opportunity to drive around, because it’s a historical surrounding, but it’s necessary that you are to some extend familiar with the Swedish history.
Arlanda is the place where swedish international airport(Arlanda airport) locates. Many travellers visit this place, and travel to Stockholm or Northern area of sweden(e.
g. Uppsala). Arlanda is the midst between Uppsala & Stockholm. It takes 20 minutes to Stockholm when you use Arlanda express. This is quite convenient express train, and you should use. If you go to Uppsala, the bus is also available in every one hour.