"Don't worry -- Be happy!" is NOT fun to hear when Life is throwing spit-balls at you. One of my very favorite lines from musical theatre is the one Tevye sings in Fiddler on the Roof: "God would like us to be joyful even when our hearts lie panting on the floor."
It seems dishonest, a kind of 'fake it till you make it' mentality. But to search for and find Joy in the simple things, like the sensory delights (sunshine sparkling on water), is really just plain good Mental Health Practice. Oh, it's more. But it's at LEAST that. Celebrate. 'Sublimate your Suffering', if you like Freudian terminology. There's Love and Laughter all around.