Happy Boy, Königsee, Bertchesgäden, Germany, September 2012, Nikon D5000 with DX 18-200mm VR lens,
180mm, 1/640 sec @ f5.3, ISO 200, 0 EV, no flash © Steven Crisp [Click on the photo to enlarge]
Are you happy? As happy as this dog?
This guy just seems so content with his big stick. He's smiling at the camera.
You know what they say ... you're as happy as you make your mind up to be.
So I'd say take your cue from this happy boy, and smile, smile, smile.