Sunshine Lollipops and Rainbows is a song made by Leslie Gore that anyone could like, well unless you are a Norwegian communist that wears a red hoodie, wears a Band-Aid on his face, has Horn-like Hair, and is obsessed with Giant robots, then you would be pissed why its playing.
An expression referring to a very happy, care-free life where you have just about everything you want. It can also be used to refer to a place where someone's life will be happy, fun, and easy. When using it for children or to refer to children, it means innocence, happy, playing, loving childhood.