That looks really awesome. If not red lava, what about sand to give a beach feel? My only word of caution on the waterfall based on my ponds, is don't run the falls outside on a day your not home. It seems to have a decent amount of splash, which coupled with sun & wind could lead to a lot of water loss. So just be sure to run it on a day your home. Would gate for it to run dry & burn out your pump.