Continuing my exploration I redid all the vegetation using much more control of what went where. It took me a while to work out that it has set the minimum height on things to sea level and a few other details, but soon enough I had things looking much more realistic.
The screenshots below also have swarms of butterflies, fish and other animals - maybe you can spot a turtle.
While browsing the web for tips on some of the tools I came across verw3948's jungle map which shows off a more vertical forest which will be great for the Moths vs Butterflies environment for me.
[CryEngine imagery from verw3948 via inCrysis]