"Beyond its scarggly streets awaits a Boys Own range of extraordinary
adventures that, for many travellers, are the sole reason for coming to Bangladesh "
What means "Boys Own range "
It means things that are fun, exciting and likely to appeal to those who like adventure. It's a reference to Boy's Own Paper - Wikipedia, the free encyclopedia- if you scroll down to 'Contemporary Popular Culture', you'll see a mention of Boys Own as an idiomatic phrase in BrE.