Make sure to look around a bit for different OSM tile renderings, the .org default is a little dry for outdoor stuff. This one is nicer:

https://www.mapbox.com/blog/mapbox-streets-terrain/

This site maybe doesn't have the greatest UI, but it works for exploring some of the data that is available:

http://hiking.waymarkedtrails.org/en/?zoom=9&lat=40.44379&lo...

(If you click the "Routes" button in the lower right it pops up a box listing the routes near the current view)