The land of milk and honey
Definition 1 of 3
Pro Tip 1/3Expectation vs. Reality
Used when a place doesn't meet someone's hopeful expectations. 
He thought moving abroad would be the land of milk and honey, yet he struggled to find work.
Pro Tip 2/3Potential Irony
Sometimes said sarcastically about a place that is far from luxurious. 
With all the noise and mess, this is hardly the land of milk and honey!
Pro Tip 3/3Not Always Literal
Doesn't only refer to physical comfort but also to happiness and fulfillment. 
For her, a small cottage in the countryside was the land of milk and honey.