I don't know how we got on this particular mailing list but we receive a brochure about every two weeks from some outfit that does river and canal cruises in Europe and Asia. No driving required. And from the looks of things, it's the sort of things older folks do.
As a matter of fact, my wife's aunt and uncle were on just such a tour last year. They went to St. Petersburg, Russia. But they travel a lot, much more than we do. But anyway, a lot of the trips sound very interesting, though the ones in Eastern and Central Europe sound the most interesting to me. But I can't get my wife interested in visiting Estonia. Lots of interesting crusader castles to see there.