Most nights I'm home with the wife and baby playing on the floor or making dinner. I enjoy cooking a lot so we take turns with that. Once my kid's in bed, we usually watch one of the many shows we have DVRed because we don't want them while our daughter is awake. I also try to read a lot, so I either have a book or a car magazine next to me. I'm actually starting to read a Dave Ramsey book.
Also, if it's warm enough, I'll force everyone to go for a walk around the neighborhood. Keeps us from getting any fatter, plus the dog loves it.