Still my favorite track on earth. Best viewing spots (IMO):
On the hill, driver's right (i.e. inside the track), at the entry to T2. In the world of motorsports, THIS corner takes the biggest 'cayoons' of any, anywhere. Downhill, blind, off-camber, double apex. The racing equivalent of a 'carrier landing'. Even scarier before they moved the outside wall back, down at the bottom. On a scale of 1-10, this is an 11. From here, you can see race traffic all the way from the exit of the front straight 'til they get to the apex of T3. And...there is a concession stand right there on the hill. Beer (yay !). Get there early.
or
Outside of Moss Corner (5A & 5

. If you're on the bank outside 5A, you've got a pretty good view of everyone making the big dive thru T4, too. Go thru the tunnel in the lower paddock (betwen T1 & T2), and walk or drive as far around the outside of the track, past T3 etc.. There are trails to get you there. Wear hiking boots.
Also...make sure you wander around in the sand hills and woods of the infield, down near T4 and Moss Corner. Amazing little world of creeks and glades etc. down there.