Grand Circle Travel/Overseas Adventure Travel, based in Cambridge, MA, has given a lot of thought to solo travelers. At the beginning of a trip, they will have get-togethers for the solos, so you can see who else is traveling alone. They have many trips with no single supplement charge. Their gorgeous catalogs are my wish books!
I first took a Grand Circle bus trip and loved it (perhaps 15 years ago), but then took an Overseas Adventure trip, smaller group, more adventures, unique lodgings, and liked that even more. And now, in my 80s, I am really happy with their river cruises. Some wond