@jon @Ruth_Mottram
So we have done Slovenia with a car a few times and I don’t know how well bus/train options may serve but here’s an outline…
Ljubljana 3 days no car necessary
Transfer to Piran, tour Postojna caves (Slovenia’s underground railway!) en route
Piran - slat flats and pans, city walls, seafood, cold water sea
Transfer through Gorica/Gorizia to Goriška Brda - wine country and walking - or go across Vršič Pass
Then to Kransjka Gora
Skip Bled.