February 13:
Walking barefoot in grass, especially if it's sprinkling. Really, it makes me happy; though I will admit it was scary at first - you know, bugs, mud, thorns...
February 14:
A rose for St. Valentine's Day.
February 15:
"Sometimes it’s a form of love just to talk to somebody that you have nothing in common with and still be fascinated by their presence."
-David Bryne
February 16:
"Happiness grows at our own firesides, and is not to be picked in strangers’ gardens."
-Douglas William Jerrold
Meaning, you can (and must) find happiness within yourself rather than trying to find it somewhere else - it might take a few trials and errors, though, from my own personal experience.
February 17:
Here's a little song I wrote
You might want to sing it note for note
Don't worry, be happy
In every life we have some trouble
But when you worry you make it double
Don't worry, be happy
Lyrics from "Don't Worry, Be Happy"