We cruised the Danube for our 30th Wedding Anniversary in April, 2018. We are an active couple in our low 50's and have traveled independently for many years. Viking's Danube Waltz 8 day River Cruise was a great alternative to ocean cruises (no seasickness). We found Viking to be the right level of "luxury" for us -- comfortable without a lot of frills we don't need or desire. It seemed to attract a group of individuals who were much like us-- laidback, not super-fancy, earthy people who enjoy the cruising experience with delicious, filling meals with a few drinks but were not on a cruise to eat and drink their way through the week.
The format with a choice of daily guided group excursions was perfect for us. We typically chose the more active, walking option with an introduction to the location we would visit. The wireless headset technology used for the guided tours was exceptional and allowed us to clearly hear the guide without huddling in tight groups. The introductions helped us get acquainted with the layout, culture, and things to see or do at each destination and then we had free time to explore each destination on our own.
We enjoyed the delicious regional dinners with local themes, meeting different guests each night (different cultures, backgrounds, experiences, ages), and the evening activities and/or entertainment.