Eco trails are a big deal in Bulgaria these days. We've always had clean rivers and impressive birch forests but since we've joined the European Union, there's been a clear shift towards being more protective of the environment as well as funding that has allowed us to restore and clean up some of our trails. When visiting, it's best to drive as busses aren't as frequent and don't come to these exact spots. Always prepare by bringing some food for a picnic or a snack. The best time to hike is the spring and then the fall. If you come in the fall, leggings or sweatpants are fine. Make sure you bring a warm jacket too. The summer is beautiful as well but night be a bit hot for some. All of the trials on this list are free so you don't need a ticket of any kind.