If you have 6 hours or a half day to spend in Denbighshire, there are a few things you can do:
1. Visit Denbigh Castle: This medieval fortress offers stunning views of the surrounding countryside. You can explore the grounds and also learn about the history of the castle at the visitor center. Time required: 1-2 hours.
2. Walk along the historic Town Walls: The town walls of Denbigh date back to the 13th century and are a great place to take a walk and admire the views. Time required: 1 hour.
3. Visit St. Asaph Cathedral: This beautiful cathedral is one of the smallest in Britain, but it is full of history and has some stunning stained glass windows. Time required: 1-2 hours.
4. Explore the Penycloddiau Hillfort: This Iron Age hillfort is located just outside of Denbigh and offers some great hiking and panoramic views of the surrounding area. Time required: 2-3 hours.
Overall, you can pick and choose what interests you most and customize your itinerary accordingly.