From Longman Dictionary of Contemporary Englisha happy/good hunting ground (for something)a happy/good hunting ground (for something)FINDa place where people who are interested in a particular thing can easily find what they want Madeira used to be a happy hunting ground for antique collectors. → hunting ground
Examples from the Corpus
a happy/good hunting ground (for something)• I pass up a roadside rest area, a happy hunting ground for new cars and ready cash.• In the early years of this century, many a collector found Madeira a happy hunting ground.• Scandinavia was a happy hunting ground for him and he did the same for Nicolai Gedda. 