As a privacy minded human, I try to avoid using proprietary software and services as much as possible. Map management is not an exception. Google maps is monopolizing mapping and routing, but there are better alternatives out there.
To plan routes, you can use brouter.de, it works perfectly for bikes. For hiking is awesome too, it shows you a lot of data needed to plan your tracks (check the settings on the right). If you want to invest a little more time, you can even set your personalize profiles, so that the routing algorithm prioritizes the routes to your desires. It's based on brouter and both can be self-hosted, although brouter does not yet use Docker.