All I can say is, I wish I could do that sort of thing (maybe in the next life haha). Sounds fantastic.
One place I'd love to go cycling is Ireland. My wife and I were there on a bus tour for a couple of weeks last summer and if you don't mind the rain it's an incredible place for cycling. The hills and mountains there aren't bad in terms of elevation but man, they are steep ! I mentioned that I'd love to do some riding in one particularly hilly area to our drive/guide. Poor Joe just stared at me and said "You would ? "
I saw quite a few bike tours out there on the road and we even passed by one tour group all on tandems. There must have been about 30 bikes in that one. It was like a watching a human powered express train literally flying down the road.