Hi!
Definite route I don't have in mind but I'll tell you my ideas with some places.
If you're coming from Albania then I would suggest to enter via Krystallopigi which is just south of lakes
Prespes. Since the lakes are shared between the countries you could tour them all round. Might be interesting to see how it is. From there you should check: Flonira,
Kastoria & Konitsa.
Just below Konitsa towards Ioannina you'll find the
Vikos Gorge best viewed from a spot on the village
Monodendri, one of the many beautiful villages in Zagori area. If you follow the road going higher you'll come across a petrified forest (last time I was there it was inaccessible due to snow but in one month time there want be any). Then, passing via Ioannina &
Metsovo towards Kalabaka and
Meteora.
From there it depends on the time you have and how long do you want to ride/stay in one place: you can go south if you have enough time and/or head east to Volos &
Pilio. Great view of the Aegean sea from mountains top, then drop down to sea level.
One more detour from Thessaloniki to Chalkidiki, but I don't have a specific place in mind and then ether follow Egnatia Odos to Alexandroupoli (fastest) or go north via Serres, Drama & Xanthi.
Hoped I helped a littlebit !
n.