There is a rail jam in july but it doesn't make the park better. MHSSC will let you dig so you can ride their park. Windells is strict and not worth the hike to try to even get there. You can buy a day pass to ski their park but you will end up spending $50 for a ticket and $80 for there park pass.
You could camp at the airstrip with a car and a tent for free. Make sure to check the whether history to find out the best time to come. Its a real drag if you get stuck with rain. Try to make it out hear from June-July. August requires a lot more hiking.
If you don't want to pay for a $50 ticket then head up at around 10 o'clock and ask a racer for his pass and clip it to your jacket.
Since your from norway i think you would have to rent a car since it would be difficult to get to mt.hood from the portland airport. Also getting to timberline everyday would be hard to. Hope this helps.
Tickets are $50, season summer pass is around $800