If you want to avoid the busy E73, this is a good alternative. Mostly just scenic, but some parts are proper fun cornering. Road surface is spotty, but takes 100-110kmh on BMWs... probably not a great idea with sportbikes.
A 60km lap to kill some time
Really nice unpavement road in Papuk National Park
כביש חביב מאוד מאוד / Very Nice Road
Old road over Učka,who vants to avoid tunel
One of Croatias best known coastal routes; the asphalt is superb; traffic is low and views over the Kvarner bay are superb.
stunning scenery on the croatian island on cres, not ideal for sports bike. perfect for dual sport e.g. africa twin or bmw gs
This was a trip which ended up to be a little bit longer as originally planned. From Tuk there is about 20km gravel road through nice valleys and mostly forrest. If you end up in the Plitvitzer Lakes, calculate at least 3 hours for the visit. They have lockers there, so you can lock up your motorcycle gear and change into some easier clothing. The visit as such is awsome.
Route for all type of drivers and all type of bikes. There is continuosly sightseen towards to Adriatic see and lots of islands. Best period to ride a tour is spring or autumn.