Loads of decent spots;
Redgate for late braking and wheelying out of the corner , Craner for awesome speed, brave overtakes and an awesome view (if far away), Old Hairpin in the sunshine with a view all the way to Redgate and my favourite, the Foggy Esses where there will be a mega crowd so get there early and look out for a stack of DSC peeps there inc me.
The Craner section has a great panoramic view all the way from Hollywood up to McLeans, not cramped and ideal for lazing on the grass in the sunshine between races and close to the stalls. Shwantz and the Ducati hospitality area if you have a ticket, Coppice on the hill where you can see all the way across to Craner, up the hill, then turn around to watch Coppice and along the straight. Esses if you want to watch them on the brakes.
Best thing to do is to find a spot and camp down, leave mates there and go for a wander to watch some of the other races at different spots.