Creating a new trail sounds interesting - I had to do similar as part of a service project when I was a kid, but I imagine it's much more fulfilling when it's for your personal use. How are you able to create the trail, is it free use public land, or more of a guerrilla repurposing of untended private land?
The land is in limbo: it's abandoned pine plantations currently being used by joggers, dogwalkers and (to a lesser degree) cyclists.
I can highly recommend trail building (both walking and cycling trails) as a combination of physical, aesthetic and intellectual challenges (figuring out how to use the terrain to be both fun and interesting/possible to ride and then moving tons of earth and vegetation to make it happen).