Chen- If you are in the Paddock Club you will get plenty of access to the drivers but need to get them at a good time.
I am not sure if you have been Paddock Club before but depending on the Suite you are in (or the host) will depend. In Melbourne last year we were in Lotus- had an apperance from Romain (and most didnt know him to be honest) and a cameo by Kimi (no funny “leave me alone” comments as he actually did no speak at all!!!) .
Japan PC last year was much better for driver apperances. We booked through Book F1 (UK) and instead of having a suite of VIP’s, at Suzuka Mercedes, Torro Rosso, Williams & Sauber all had 2 tables of VIP’s- so we had drivers from all come up for a visit. If you just want an autograph or photo its fine, but a longer chat is harder and better to get them on the way out and most will spend some time.
In Melbourne last year we had people on our table who would sit down, watch the TV and be shocked when I showed them a photo of Webber & I, or my mate & Massa etc. The drivers do wander a fair it due to their committments so wander around and you will see a fair few. Most are very good for a quick photo as they are very busy of course, but I say go for a walk instead of watching the TV and you will bump into heaps of people.
PS- If you see Sir Jackie Stewart do make the time to say hello, this guy is a gem!!!!