I read about Burg Eltz in Rick Steves' guide book. Our original plan was for May 2020 with a bike and barge from Koblenz to Metz which had included Burg Eltz. Then that trip was cancelled, we rebooked as Cochem to Metz for Sept 2021, which was also cancelled. Ultimately, we ended up on Cochem to Merzig in October 2022. We arrived in Cochem a few days early, and, on the day of departure, I planned our excursion to Burg Eltz by train and bus, returning in time to join the others on the barge. Other than the fact that it was pouring rain, the setting was amazing, and the castle too. My sister is a hiker, and I'm sure would have liked to hike in the area, but we didn't really have time. She did walk down the path back to the car park, whereas I took the shuttle bus.
I think that we got the best of both worlds, a chance to visit Burg Eltz, and to ride the Maare-Mosel bike route, which was not included in our original Koblenz to Metz itinerary, but was on the Cochem itineraries. (I was trying to figure out how we could do it at the end of that tour, but eventually gave up; it just would have been too difficult to do.)