what a coincidence that i would happen upon such a relevant article on babycenter.com this afternoon - "how to raise a happy child".  the 2nd topic, "make room for fun", reads:

Although nonstop entertainment and ice cream for dinner may seem like every child's dream, what actually makes your toddler happiest is much simpler: you. And that's the first key to creating a happy child says Hallowell. "Connect with them, play with them," he advises. "If you're having fun with them, they're having fun. If you create what I call a 'connected childhood,' that is by far the best step to guarantee your child will be happy."