Oh why not...
A night of cuddling with my partner (No sex, just talk)
The look in her eyes when I go pick up my daughter.
Her yelling from my ex-wifes porch "DADDY!"
My daughters little arms wrapped around my neck.
Her saying "You're the best daddy in the world"...(that one makes me bawl almost everytime, I was so afraid I would be a horrible dad since I had a horrible dad).
Her saying "I love you, Daddy"
A good cry (Normally shortly after one of the previous five statements)...weather it be about good things or bad.
Listening to music
Peace and Tranquility all depends on your frame of reference.