In reply to coldfell:
I've done a similar trip:
Flew to Venice, car hire, sightseeing
Drive North through Trieste, climbing at Napoleonica
Into Slovenia, climbing at Mija Pec and surrounds
Drove down to Paklenica, climbing, sightseeing, islands etc. Was an easy drive
Drove back up the coast road to Istrian Peninsula, climbing, sightseeing, all very beautiful and retro-Italian
Back to Venice.
Brilliant couple of weeks