Quite a bit of this game revolves around waiting. Yes black jack is good fun and poker etc, but they're short lived games and have now been here for a while and dont necessarily require gamer skill. So how about we have an arcade area too? Here could be old classic games like Tetris, Pacman (call me oldschool), Tennis (where you can play against other players), space invaders and many more classics! I'm sure the programmers would find these a breeze to code nowadays!
Having a high score system and maybe the odd merit as reward for getting over a score (or cash prizes) would be fantastic!