Yeah, just buy a vaporetto pass when you get to Venice - ride the vaporetto boats (water buses) all day. The #1 goes up and down the Grand Canal. Bring plenty of memory cards and a spare battery or two for the camera; you'll take lots of pictures on this canal. The trick is getting a view over the side of the boat. Take a vaporetto all the way out to Burano island (a long ride, maybe 45-60 min each way from Venice) to see an island of colorful houses, really cool.
It's really nice to take pictures at night and in the morning in Venice, too. Far fewer tourists. On my last visit in May, I walked in the morning from the train station to Rialto - but on the south side of the Grand Canal, through the San Polo neighborhood, through a maze of quiet pedestrian streets and squares, not touristy at all, unlike the main (direct) tourist route on the other side of the canal along Strada Nuovo.
As far as driving from Split: I've driven between Split and Trieste (basically). There is some amazing scenery here and there - but it is time consuming to stop and detour and take pictures. You haven't said how much time you have, but it would be a shame to rush through a drive between Split and Venice without at least a day or two to stop (preferably a week). Most of the drive north from Split will be along a modern highway inland without very little to see, assuming you want only a seven hour drive to Venice. (Coastal highway would take forever to drive north.) The drive should be pretty easy (expect to stop at the border crossing between Croatia and Slovenia - may be quick, maybe not in June), but unless you have built in time to stop along the way, it's just easier to fly to Venice and take the extra few hours for taking pictures in Venice, where you'll never run out of things to photograph.
If I had time to stop for a few days on that drive, some random stops (but again - they take time): Sibenik, Krka National Park, Plitvice Lakes National Park, Kvarner Bay (near Rijeka and Opatija), Rovinj, and Piran, Slovenia. (Some would stop in Zadar. Porec, and Trieste; assume you would already have seen Trogir if you are starting in Split.) It's really not the case where you can just pull over and take some snapshots from highway viewpoints and keep driving, in most places. You need time if you want pictures.