An 18th-century Arcadia in rural Devon. A subtropical seaside Cornish fantasy. An Elizabethan manor with a quintessential English garden. Victorian walled vegetable plots, orchards, parterres and pergolas, wildflower meadows, shady dells … U.K. accommodations site The Good Hotel Guide has chosen 20 of Great Britain’s best hotel gardens. (Dollar prices are accurate at publication but may change with exchange rates. Check hotel websites for special deals.)