a chocolate box place or thing is very attractive in a way that does not seem real.
We drove through a series of chocolate box villages on our way down to Brighton.
(always before noun)
chocolate box
adjective in art, describing a sentimental or romantic style such as you might expect on a chocolate box. Generally used with reproach if not with a degree of contempt UK, 1901
chocolate box
Something that seems unreal because it is so appealing or attractive. The phrase is always used before a noun. This charming little town is totally full of chocolate box houses.