I'm on track to reach 6000 km in the coming months. I'm almost at 5500 now and just plan on riding easy on the weekends. Last year I rode too hard for my taste in the winter and ended up a bit depressed about riding in February. I am hoping to start fresh this spring, so I'll ride only recreationally through the winter. I want to ride my bike to enjoy the scenery and open air, not to train.
I'm using the spare time to run a lot and swim a little bit. I'm trying to spend more time stretching, and do more strength training starting November...
Overall it was a great year on the bike, especially the summer.