I built MyHikes.org back in early 2015 as a way for me and my friends to document our backpacking and hiking trips. This year I decided to open it up to the public for feedback and to see if there were people out there that wanted to share their trips via GPX. I got a bunch of people to sign up and a bunch of new trail data from 2017. The data set is small, but I'm not really aiming for large numbers, just trying to get new trails to help people find new places to explore.
If you enjoy hiking or backpacking, feel free to check it out. You can import any GPX file from a multitude of apps and devices (like Garmin trackers, etc). All/any feedback is much appreciated.