The hiking guide Graubünden Nord by Kümmerly+Frey offers 70 easy to moderately difficult tour suggestions. Richly illustrated and simply described, you will find everything you need to know to plan and carry out your hike: altitude profiles, distances, degree of difficulty, transport and catering options and much more. You can download the GPX data free of charge.
A removable map is enclosed with the hiking guide. It provides an overview and helps you find your way around when the battery in your smartphone gives up the ghost.