My Merrell's "Jungle Moc" are my go to shoes for any kind of vacation that requires walking. They are really comfortable and hold up. I've marched all over many a cobble stone streets in Europe as well as Boston, Seattle, and even local hiking (rocky terrain).
Another pair is on my wishlist for Black Friday!
As far as sneakers go, my New Balance with orthotics were wonderful. My Brooks were also. A lot of folks like OC and Hoka, but they did not work for me. I think comfortable sneakers are an individual thing.