Cross-country skiing trip from Sognsvann to Ullevålseter (nice cabin in the forest, where it is possible to rest inside and eat and drink something), and back to Sognsvann.
If it is possible (almost every day from January to March), it will be nice to take the way back over the frozen lakes Åklungen and Sognsvann.
I really recommend it to stop for a bite to eat at Ullevalseter, it is very nice and cosy.
I also recommend to do this trip during the week, on weekends is this area very crowed.
The first part of trip from Sognsvann to Ullevalseter is partly illuminated, so it is also possible to do this trip after working, even in January. But then it is obligatory to take an electric torch with you. It is not recommended to do this trip at night.
The second part of this trip is quiet steep downhill, so this trip should not be the first crosscountry skiing trip.
It is allways reasonable to look up the weather forcast, and the snow conditions on the crosscountry skiing tracks: