I went to the 2012 Malaysian GP so can answer a few of your questions.
We sat in the grandstand at turn 1 – I think that’s the K1 grandstand. I’m not sure which block we were in but it was on the right-hand side of the stand. We had a fantastic view down the main straight, plus turns 1 & 2, and we could see some of the straight from turns 3 to 4. I would definitely recommend these seats to anyone.
Regarding the shade – if you’re too close to the very front or very back of the grandstand, you will get wet if (or should that be ‘when’) it rains! We were sitting about halfway up and kept dry. I wouldn’t say there’s more breeze at the top, really… I don’t remember there ever being any breeze at all :-/
We stayed in KL over the race weekend. It is such a great city and well worth visiting! Some places really get into the F1 spirit, and the ‘local’ teams are bound to have promotional activities/events – we went to a Petronas-sponsored event where we saw Rosberg and Schumacher, and a Caterham event with Kovalainen, Petrov and Van Der Garde. There was also some kind of party near KLCC where we saw heaps of F1 people, but the only one I can remember for sure is Alonso. But suffice it to say, there will be lots going on to keep the F1 party going!
It is really simple to get from KL Sentral train station to the track. You can buy a ticket for the whole weekend, then you get the train to the airport and shuttle bus to the track. I think it took about an hour. On the Sunday evening we had to queue for the bus for a while, but other than that it wasn’t really too bad. It was much easier to get between the track and the city than some other races I’ve been to.
I’m not sure about autograph sessions as we didn’t go to any, but I remember seeing people queuing on the Sunday morning so it was probably then!
I’m also not sure whether there is a pit lane walkabout. One thing about the Friday at Sepang is that it’s open admission, so regardless of which grandstand you have tickets for, you can sit wherever you like. We took the opportunity to sit in the main grandstand for a while so we could see directly into the pit garages.
I’m afraid I can’t remember whether people were allowed onto the track after the race – sorry!
One more thing: Sepang is very strict about not allowing you to take food or drink into the circuit, even bottles of water. So make sure you take plenty of small change as you will need to buy lots of drinks during the long, hot days!
I hope you have a fantastic time. Malaysia 2012 was one of my favourite GP experiences ever. Enjoy every minute :)