I use OrganicMaps a lot for long walks and it's great. Works perfectly offline if you have downloaded the map of the region beforehand, which is helpful if you are in an area with poor reception or just want to conserve phone battery by turning off data. And being OSM, it is great for showing less prominent paths/trails and other useful info like drinking water sources, picnic benches etc. And supports importing GPX trails. So IMO it's way better than Google Maps for this use case.

It's also very easy to edit some basic data through the app so if you notice an error in the map it's usually possible to fix it right there and then.