Danube excursions

We are going on the Viking Danube waltz river cruise in October and are wondering, if those of you that have been on this enjoyed the included excursions or would recommend booking our own private tour. Please be specific as to which ones you would recommend.

Thank you in advance for your suggestions!

moved to River Cruising forum

My Mom and I are doing the Danube Waltz in December and would also like to know about the recommended/not recommended excursions, including if the trip to Český Krumlov is worth it. Thanks in advance!