Walking trails exist in all the mountain ranges in Bulgaria: Rila, Pirin, Stara planina, Rodopes, Sredna Gora, Vitocha (vicinity of Sofia). In all almost 35.000 km are marked. Maps in 1:50 000 exist. Those for Rila and Pirin contain route and hut descriptions in English and German for E4 which passes Sofia, the Rila mountains and the Pirin mountains. E8 passes Sofia, Rila and parts of the Rodopes mountains. There are also some guidebooks in German.
Many huts exist where meals are served in the holiday season. It is advisable to try to check this in advance and it might be a good idea to carry some provisions if you are uncertain about meal service. The trails in general start in villages with hotels, youth hostels or sport centres.