If you have 24 hours to spend in Argyll and Bute, here are some suggestions:
1. Visit the Inveraray Castle. This castle is a must-see, and it will take you about 2-3 hours to explore the castle fully.
2. Go to the Loch Fyne Oyster Bar. This restaurant is renowned for its fresh seafood, and it will take you about 1-2 hours to dine here.
3. Explore the Crinan Canal. You can take a walk along the canal, and it's a scenic spot to take photos. It will take you about 1-2 hours to explore the canal.
4. Visit the Kilmartin Glen. This area contains some of Scotland's most important prehistoric sites, including standing stones and burial cairns. You'll need about 2-3 hours to explore the area fully.
5. Take a boat trip to the Isle of Mull. The island has stunning scenery, and it's a great place to see wildlife. A round-trip boat ride will take about 3-4 hours, depending on where you depart from.
Overall, these activities should take you about 10-14 hours to do. You can also spend the remaining time checking out local shops and pubs, or exploring some of the other attractions in the area.