We had a great time in Sicily. It is a full, busy itinerary but does include some downtime to explore by yourself.
The tour, inevitably, involves a lot of ancient ruins including archaeological sites, temples, churches. It can be a bit much at times depending on your interest. The quality of accommodation varies from very good to adequate. Breakfasts in Sicily are definitely not the highpoint of the day! However, dinners are very good, especially if you enjoy seafood.
