Oslomarka
is the large forest surrounding the city. This is an important recreational area for the citizens of Oslo, and quite unique for a capital. Take the T-bane to Holmenkollen line 1, Frognerseteren line 1, Sognsvann line 3 or Skullerud line 3 - in the opposite direction of Sognsvann, bus 41 from Røa T-bane to Sørkedalen or bus 51 from Nydalen T-bane to Maridalen. You can also visit the tourist association at Storgata at Kirkeristen tram stop for good maps and inexpensive accommodation alternatives in Oslomarka.Kongsberg is a beautiful city well-known for its silver mining history. The city is located about an hour and a half west of Oslo by train or bus. The Kongsberg International Jazz Festival is hosted here every year in early July.
Fredrikstad is a very enjoyable city not far from Oslo, with an old, walled old town and lots of streetlife in summer. Trains run approx every hour taking 1h10min, and express buses run about 10 times per day 1h30min.
Tønsberg is an attractive seaside town with an attractive city centre. It's the oldest town in Norway, and even if this isn't instantly visible, there's lots of history to digest. Excellent highways will take you to the city in an hour from Oslo. The train uses around two.
Drøbak is another of the picturesque, small seaside towns dotted all over southern Norway, and the closest to Oslo. Nice place to get away from the big city bustle, even if Drøbak also can become crowded in summer. Buses run at least hourly.
Son is also one of the coastal pearls. Get local train to Moss, alight at Sonsveien station, and get the bus that meet most but not all trains.
Drammen was earlier a totally unremarkable industrial city dubbed "the biggest road crossing of Norway". Even if traffic is still rife, the city has gone through a face lift, and their centre are as cosy as any. TimEkspressen bus line 1 every hour, day and night and 10, and 3 trains an hour gets you there and away.
