Pros: Very accessible
Cons: You might meet me there
Ok folks, I'm biased,
This is my home area and where I work ( if you can call being payed for what you love to do work ).
Just a few minutes past the Holmenkollen skijump, biathlon and nordic skiing arena, host of the 2011 nordic ski world championships, you find Oslo Winterpark/Tryvann', a very accessible area for anybody in Oslo.
During the weekdays you will have the slopes almost to yourself daytime. The people you meet are often tourists, in the evenings the locals start coming up to the roof of Oslo. In the weekends it's more crowded, but if you're there when it opens ( 10 am ) you'll have a few hours with no lift-lines. Don't be surprised if you run into some skiing legends, be it alpine, snowboard or telemark, in the lift system
It's not a resort per say, more of a ski centre. Ski, board and cross country rentals at the "top centre", the area is served by 5 ski schools, all of whom will provide you with a personal trainer for any kind of skies or board should you so desire.
Park : Two professional park rangers keep the park in good shape all through the season with one blue and one red line. Large halfpipe where the national team trains and also where the national championships are held.
Pistes/slopes : 4 green, 7 blue, 1 red and 2 black ( the longest black, Wyllerløypa, is where the Oakley Arctic Challenge has been arranged the last two years ).
The next season (2011/2012) the TTR and WSF World Snowboarding Championships will be held here in brand new slopes and halfpipe, construction started a few weeks ago.
The area has seen massive investments over the last years, and this will continue for 3 more years.
Varied skiing to be had for all levels of skiers. I'll be the first to admit the off-piste isn't world class, but it exists. One ski school, www.tryvannskiskole.no , offers guided off-piste tours ( depending on snow conditions ).
The afterski possibilities are endless, you can start with dinner close to the Holmenkollen skijump and "work" your way down to the city centre with more cafés, restaurants, bars and clubs than you can shake a stick at, or visit the new Opera, one of many landmarks in Oslo. Where else than here can you do that?
All this plus some of the best cross country skiing in the world makes Oslo a good choice if you want a northern European ski+city ( actually ski IN THE CITY - the geographical centre of Oslo is close to Tryvann ) vacation.
Here's a review from Financial Times on Oslo Winterpark :