Amber: The Next Generation
The GM is quite happy to take on a small amount of extra-game RP, if you want secrets kept, but this has to be by arrangement, and bribes may be demanded.
Bribes are always good.
Cake is a good bribe, especially home-made cake, but only in main sessions. Pretend the GM is a diabetic with a dodgy insulin fridge the rest of the time.
Be nice. Keep up your player contributions, or let the GM know you need help with them. Let the GM know if you’re going to be late, preferably before the game starts.
Add stuff to the wiki if you want. Make up NPCs. The GM is fine with that. Make up worlds and habits and gods. The more work you do, the less the GM has to concentrate on world building and the better we’ll all get along.