Thank you Lane and Andrew for your detailed answers; I've always found the people on the RS Travel Forum pages to be helpful and well informed. I try to do the same in return. I am very appreciative.
My initial thought was to take a bus or train from Budapest to Ljubjana. My daughter who knows my quirks and has been to Slovenia suggested I drive round trip instead. This will give my wife and I more flexibility; we enjoy driving and stopping as the whims of travel inevitably take hold.
So, that said, I would like to hear your thoughts to my new, crazy revised schedule:
8/9 - Leave BP 6:00 AM (we arrive BP 8/4). Google tells me it is a 4:35 drive to Ljub...so, arriving around noon allows time to take in some sights along the way. Following Andrew's advice, I plan to skirt Ljub and take the scenic route via Skofja Loka and Kropa to Bled. Lunch in Skofja, stopping to take in views that 2:20 min ride according to Google, I'm allowing 4:00 hrs - therefore arriving Bled around 4-6pm or, hopefully before nightfall! Too much? (btw, I just checked, sunset Bled on 8/9: 8:23 pm!!).
8/10 - stay in Bled & Bohinj area - sleep in Bled (taking Lane's advice rather than sleep in Kranska)
8/11 - early start to Kranska, Vrsic Pass, Soca, Kobarid...If we depart Bled at 7:00 am is it unrealistic to think we would be in Kobarid by 1:00pm?...I am thinking of driving down to the coast to Grado, Italy (sandy beach!!) arriving dinner time...spend evening in Grado.
8/12 Beach day
8/13. Grado....Trieste...Piran....My daughter, like Lane, says Piran is a nice, short visit...haven't decided whether to stay in Piran or make the drive to Ljubjana
8/14. Ljubjana
8/15. Ljubjana - or, late afternoon drive to Maribor....is it worth checking out Maribor for and evening and morning..before driving back to BP (arrivial 8/16)
approx 1500km / 940 miles (we could take train or bus r/t from BP to Ljub to cut that down by half). As Andrew said, if I take bus or train, then I might have to pass on the Skofja/Kropa detour to Bled, And, Maribor might be off of the table too.
Again - thanks for any input - and any suggestions of what I am missing. For me, August seems like a nice time for a summer swim in the Adriatic..at 60 my strenuous hiking days may be behind me!!!