Sognsvann Lake tomorrow

We're going to Sognsvann tomorrow, end of T-Bane (subway) Line #2. There is hiking around the lake and an option to hike to Frognerseteren, where we can take another train line back to the National Theatre. Weather should be 21 and sunny. Even though we all have a major paper to write, we figured we could do some reading and planning on the beach and enjoy the nature Oslo has to offer.  This is the area of the Oslomarka where we were supposed to hike this weekend.  Sadly, that was cancelled because of rain.  This will be one of our last chances to go.