I think what makes it fun is the atmosphere and the kids that they are growing and playing with. My children are all between 1-3 yrs old. they love having music in the background during their free play, or participating in action songs such as head, shoulders knees and toes, If you're happy and you know it, the wheels on the bus, etc .
I think they also enjoy being part of a routine that they can predict and being served food that is different from what they get at home in a fun or different way.