Hallo ES/2,
Maybe I can help you in some way. Im not in Istria, but Im from Zagreb from MZ forum Croatia.
I think that good palces to see is:
Rt Kamenjak (near Premantura)
http://vwkombiji.portbb.com/viewtopic.php?id=2828 Kotli, Hum (the smallest town in the world), Parenzana (former train from Trieste to Porec, now is for bicicles, but before year or two was possible to go with cars on some parts)
http://www.citroenclub.hr/forum2010/ind ... pic=5332.0 Motovun, Labin (one member of Croatian MZ forum have good restoran near Labin and I think that he have Quad tours, so maybe he better know some interesting palces in Istria), Raša...
I was one time in little camp in Rovinj (cca 500 meters on left side before Camp Polari), I dont know did they work in October, but owners are one domestic woman, and one former teacher from Austria. That can be good place to stay.
So, if you go through tunnel Ucka, maybe is better to go from Rijeka through Matulji and Lovran on the road near the sea. Shorter is through tunnel Ucka, but is nicely to drive near the sea.
I dont know did I help you, but I will be glad if I am.
Tom ("ernesto" on Croatian MZ forum)
BMW R25/3+Steib LS200, BMW R65...