I recently visited the area and noticed you just added in some of these trails. It looks like you used Strava Heatmap, which is great. As a tip, you should check out the USGS 3D Elevation Program background in the editor. This shows LiDAR imagery and I've found it really helpful for trail mapping/tracing by using this imagery paired with local trail maps or heatmap data. LiDAR will often show evidence of really old roads that no longer exist, so it shouldn't be used as a primary source, but it's really valuable to show details under tree canopies. 