Take tram 11, 12 or 13 or bus 20 to Torshov.
Driving? Not a great idea. If you really have to drive, message Simply Red for advice where to leave the car.
Live hare trail. No walkers, only one trail. If there are walkers, I will try to use some holding checks to help you. A-to-B run. Bring a headlamp and cash/plastic to buy beer. Due to the weather around 0° and light rain in the last days, sidewalks are slippery, so spikes are a good idea.
If you are interested, I will arrange pizza at the end.
Good to know: Thursday is the international Kiss A Ginger Day. :-)