What makes a good day? I keep track of what I really enjoy, sometimes they change, sometimes they stay the same. Try to hit most of them per day. No particular order. Usually when you recognize what really makes you happy, it's easy to put them in your day, even if its just for a little bit.
Play with my Kid.
Play with my dog.
Hang with Cool People.
The more things you enjoy in your day, the more likely it's a good day! The more good days you can string together, the more likely a good life. Engineer your Life.