Well, as far as I'm concerned (I'm no expert either
) fanfiction is a story you write about one of your Skyrim characters. Writing about their adventures makes you exciting to go out there and experience more. In my case the whole Skyrim experience got more realistic thanks to fanfiction.
If you want to have fun in Skyrim when not doing quests you'll have to use your fantasy and be creative. You could come up with your own quests. There are plenty of locations and NPC's you can use. Of course it won't get you a reward but it at least gives you something to do.
I also like traveling. Not fast travel, just wandering through the wilds of Skyrim. Search a map of Skyrim on Google and mark the locations you want to visit. You can choose to whipe out all the Imperial/Stormcloak camps you can find on your map. Just something I do every once in a while.
It's also a good idea to create more characters than just one. I have one character who joined the Thieves Guild and the Dark Brotherhood and another character who joined the Blades, the Stormcloaks and the Companions. There are lots of choices and decisions you can make in Skyrim. And making different decisions can give you a totally different adventure / experience..