Is the sentence incorrect/not idiomatic?

Basically, what's wrong is the use of "shining." It simply is not part of the idiom to use that phrase. A native English-speaking person might say "The life...is full of opportunities" or "...is fraught with..." or "is filled with..." etc. But "shinning" simply is not idiomatic. It's not how the word is generally used although, I hasten to add, the meaning of the sentence would be immediately clear to anyone. It's just that they'd never say it that way.

They must be bright.

It's not idiomatic, Ms Tan because, of the millions upon millions of possible collocations, these just don't get collocated all that often [oops, a passive; S & W must be turning over in their graves].

It's perfectly correct in that it is fully grammatical.