In response to "so long as you don't need a long narrative":
The format would be to have a few standard entry fields so the information important to potential users of the trail/route is available. Required information would only include region, trip length, loop vs point to point, and trailhead. Some general description of the route would be necessary. This would be enough to make the information useful.
There would be optional information fields that might include elevation gain, maps, best season, permit and regulation information (like bear canister required or must camp in designated camps), web links to area (forest service/national park sites), directions to trailhead, other transportation information (especially for a point to point route), and possibly GPS coordinates (probabaly optionally included in the route description). No detailed description would be required, but as much information could be included as an individual wanted. Pictures could probably also be included.
Would there be any other information that would be helpful? I want to make the system easy to use so don't want to REQUIRE entering anything but the most essential information, but want to ALLOW as much information to be entered as would entice a reader to GO!