Have fun! That trip was a blast for sure. Vintgar was really awesome, and it started raining while we were there so we had it almost to ourselves. My wife and I both enjoyed Lake Bohinj quite a bit more than Bled, probably further than a day trip from Ljubljana though. I think if we had to do it over we would of stayed in Bohinj and not Bled.
I remember there was a train we could of taken through the mountain (like drive the car on the train) but we decided to just drive from Bohinj to Bled...that was a mistake! Took forever, and for sure got lost several times as the GPS was spotty there.
I've been to Venice before and Piran is similar, but very different at the same time. Piran was probably our favorite stop overall. Look forward to your photos and safe travels!