"One-stop scenery" means that every place has its own unique scenery, and you don't need to stay in one place for too long.

"I mean you don't have to stop flowing for long" means you don't have to stay in one place for long, because every place has beautiful scenery to enjoy. This sentence means that you can move on as soon as possible and explore the scenery in other places.

For example:

The scenery here is very beautiful, but it will stop as soon as it stops, so it is not necessary to stop the flow for too long. It means that the scenery here is beautiful, but there are also beautiful scenery in other places, so you don't have to stay here for too long, you can continue to explore the scenery in other places.