There are some good forest roads in Slovenia - logging roads etc, which are easy to get to. They are everywhere, particularly around Bled and Lake Bohinj. Also do the Visic Pass - spectacular. We did the coastal road in Croatia as well - superb riding, even on the manky scooters we were on.
Also did some very rough tracks - which might have been actual roads; not sure - in the hills above Tirana, and then up and over mountains towards the Greek border in the Pogradec area. We didn't have a route as such, just a general direction down through the Balkans, Albania, Montenegro and Greece then onwards to Mongolia, but just followed tracks and roads that looked interesting, as we found them. And we were on 110 Chinese copies of Honda C90s, which made it all the way to Ulan Bataar via some very dodgy roads. So if they can, then anybike can, even in crappy weather.