I went to the GP there 2 years ago. Stayed in Nice and got the train too. We had stand tickets in the swimming pool complex for the race which were great and the seats are right in the yaught marina and has a big screen in front of them so you wont miss a thing. Those seats are expensive and if you dont already have them I would imagine you will pay way over the face value to get them. We got general admin tickets for the qualifying and got a sopt at the last bend, its a good enough spot but get there early because the trees will block the view of late arrivers. One tip is bring loads of suncream and cover up, even though the temperature might not be huge (mid 20s) the sun is strong and you will be in the sun all day without shade. Bring bottles of water in a bag because it takes ages to get from your seats to the sales points and when you get there the prices are mad, as are all prices in Nice! Its a great experience. We went on a package trip an dended up getting our room robbed, some rings, watch and jewlery, they left camera and race tickets behind. The strange thing is the door wasnt forced so I assume it was a hotel job! We left our key at reception while we went out to watch the second half of the FA cup final and they lifted the stuff then, since then I never hand my key into reception, its a clear sign the room is empty. Othe than that its a brilliant experience!