Advice required on Assen GP

[Faldo]

Thinking of going to Assen this year and just need to know two things:

Camping - Can it be done on-site and if so is it 'bookable' or turn up and hope for the best? I have found a campsite called 'Sudosa', if anyone has experience of that I'd be interested in opinions.

Admission - Tickets can be bought on the circuit's (rather vague) website, but where is the best place to be? I'm not bothered about being in a grandstand unless all the open areas are shite, and should I be able to buy them on arrival?

Any other advice welcome .

P.S I'll be leaving the UK on Friday morning, so if campsites fill up on the Thursday I'm buggered.
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