I've always wanted to see New York...
Anyway, thank you everyone for the great ideas. I'll try them all, and 130 games on one site... That'll be fun.
The ping-pong ball idea reminds me of another two-player game that the kids probably already know - Paper Football.
As for getting the dad into it more, the best thing right now for me to do is just help him with the workload. Maybe. I guess relieving him of some of his duties probably makes it more fun, so it might help. Again, maybe.
And again, I thank everyone.