Acting as a History and Travel Expert, design a 9-day itinerary exploring Scotland’s most famous castles. Recommend visits to Edinburgh Castle, Stirling Castle, and Eilean Donan Castle. Include historical context, guided tours, and tips for staying in nearby heritage hotels. Provide recommendations for visiting smaller, lesser-known castles and scenic drives through the Scottish Highlands. 
<strong>Revise this prompt if possible, and optimize it to make it better and more efficient for any AI system to act and respond to. 
If possible run your optimized version.</strong>