@SPARKY1922 I managed to get a working Dive Lot in Sunlit Tides. I still have to work out the exact steps before I can do a tutorial. He didn't skip up into the air when he crossed to the lot. At first he simply vanished. He was still there but invisible. So I decided at that point it was impossible - but I had another go and reset the Dive Buoy using Debug Enabler. It was the only option I had. And after than he just swam over to the buoy from the beach and dived.
Terrain Paint doesn't seem to work there though. And the sea grass turned blue so it is also invisible. I didn't do much decorating just in case nothing worked. But I got him to catch a few fish, explore a dive cave and harvest kelp. The thing I did was push the terrain down as far as it could go. The seabed in the dive lot is totally flat but he's diving in it. It's dark at the moment and my screen shots are a bit dark so will wait until it's morning in Sunlit tides and try for another screen shot.
Once I can get a Dive Lot that works first go I'll do a tutorial.