Thanks for all your praise, guys and lady

Actually it was pretty easy and quick to set up (perhaps 3 hours total, with all the testing and reseeding for the clouds), 2 warped SSS for the creeks, also used to mask out or in the veggies (together with some altitude settings), and then throw in the veggies. A little painted shader work to lower the water where the canoe hits the water, and a 'wake image map shader' for some additional waves around the canoe, though hardly visible. 2 V2 mist layers. The ST veggies do it, really.
The TG editing tool is enormously helpful toot; tree in the wrong place, just remove or relocate.