Play with your children. Let them choose the activity, and don't worry about rules. Just go with the flow and have fun. That's the name of the game.
Read books together every day. Get started when he's a newborn; babies love listening to the sound of their parents' voices. Cuddling up with your child and a book is a great bonding experience that will set him up for a lifetime of reading.
Schedule daily special time. Let your child choose an activity where you hang out together for 10 or 15 minutes with no interruptions. There's no better way for you to show your love.