River-Simon, on the ship after Niska's arrival at Milliways

River's in the common room, sitting crosslegged on the floor with her elbows resting comfortably to either side of the card game in front of her.

It appears to be a highly complex version of solitaire, incorporating two Tall Card decks and a 20th century 52-card deck. This particular variant may have not technically existed before she started playing, but she's absorbed in it.

Just be glad she hasn't broken out the Exploding Snap cards yet.