Nobody pictures the Cotswolds with kids. They picture honeymooners, antique hunters, and people writing novels in tearooms — and fair enough, that’s all here. But the region is sneakily great with an 8-year-old in tow, once you know which hedge maze has the best pizza window and which trout farm lets you keep the trout. Here’s the short list, tested in the field, of the best things to do with kids in the Cotswolds — from rhinos on a manor-house lawn to a half-mile of yew with a golden dragonfly hidden inside. My family and I have never been bored…