I went last year with a few mates for the entire weekend, absolutely brilliant.
We originally tried to get tickets for Farm, but they had sold out sharpish so went for Club.
On the Friday we spent mincing about walking the circuit as it's open to go anywhere.
On the Saturday we were able to access the Grand Stand looking down on the Paddock for Qualy, the atmosphere was top notch watching Button land himself 2nd spot.
The Sunday was then spent in our designated seating area. We were pretty fortunate enough to have a screen dead opposite as well as a radio to hear exactly what's going on.
For after the race we took along a BBQ & Poker set to enjoy while all the traffic flooded away.
Overall a great experience, the sun was absolutely spot on all weekend, it was amusing to be asked where I had been on holiday, only to answer 'Silverstone' to a slightly suprised face!
However while myself & my mates are huge F1 fans, we shall be skipping Silverstone this year, partly because we also have interests in other motorsports, namely Le Man, but also so that it feels 'fresh' come our return in 2008.
Things I'd recommend:
Radio - Critical to get the feeling of whats going on, for example when Kimi was catching Button it was great to hear the split-times falling & visually seeing it as they lapped.
Cap/Sun Cream - If your as lucky with the weather as last year, remember to pack this, I don't suffer from the sun personally, but my mates found this a God send.
Qualy Grand Stand Area - Definately gain access to this to overlook the Paddock, very interesting to see the team's operating & awesome to hear the car's blat at full chat over the line.
Race Luffield Terrace? - From walking about, this concreted area looked a fairly decent place if you took your own seat along, plenty of 'F1 fans' based here.
BBQ - Chill & relax afterwards, let everyone else sweat there way out!