I needed two caves. Since most of the things I've done/started are all man made to an extent, I've never really though about how I would do a cave.

The First one Is going to be a goblin cave, and it's pretty much done.
I created the whole thing using Render Clouds function, after which I just started messing around. Is that a popular method?
Goblin Cave copy.jpg

The Second one is going to house some sahuagin.
Its just me cutting a path through a mask with a soft brush and again just playing around with some ideas.
Under Water Cave copy.jpg

Any suggestions, specifically on map 2 to make the area where the beach meets the dirt area appear more like a cliff then it does?

I played with some of Kepli's falsies but the most I could figure out how to do with them was make them into the underground river tunnels and the rises in the ground.