With all the different locations, quests and misc objectives in this game, it's very easy to get side-tracked. It does seem that every quest or MO that you complete spawns 2 or 3 more. I'm interested to hear how and where players end up after starting at whatever place.
To get this post started, here's an example of (one of) my side-tracks; I noticed I had 3 or 4 MO's concerning The Bard's College, so I went to Solitude to clear them up. This led to The Mind Of Madness, which led me to the Blue Palace and the Jarl and steward, which led to more quests and MOs. While in Solitude I visted the Winking Skeever and met Sam, which led to A Night To Remember, and waking up in Markarth for my first and so far only visit to that city. Being in Markarth led to The Foresworn Conspiracy & Cidna Mine, and couple of ongoing MO's, and also started 2 Daedric quests which are still ongoing. In addition to 2 other ongoing Daedric quests! I could go on (and on) but hopefully you get the picture. And I've still got an outstanding MO at The Bard's College!!!
So over to you, I'd love to hear of other side-tracks, be as brief or as long as you like, spoilers or not, it's entirely up to you.