I am not brain-dead. Surely you can judge where they can walk when you don't even have any doodads placed yet. For example I could make nothing but water and say that they can walk there, because I will make doodads that'll serve as a floor.
Don't try to half-ass excuse it. If you make nothing but water and pretend there's going to be a doodad floor, you're not carrying out the exercise of using the height tools properly in the first place.
Make a terrain using the height tools with places where the units could walk. The instructions are easy to follow and leave plenty of room for creativity, so there's no reason for you to keep trying so hard to sneak around the rules.
This is the last time I respond to a message from you like this, you are getting annoying. If you're only here to make wiseass posts in an attempt to outsmart the teachers instead of coming here to learn, then there's no reason for you to be here in the first place.
Waterfalls without doodads? No.
It's entirely possible, and has even been done well on multiple occasions, so stop acting like the people here can't try that themselves. If you're just going to negatively criticize people's work (people who are actually following the directions, by the way), instead of providing helpful comments to people, then just leave. You're not being very helpful to anyone; not to yourself, and not to others.
Be rid of them before I puke.
Enough of that... If you want to stay here, stop that.
Make some mountains. All I see is a spiral with water in it. You can still do a spiral if you want, it just needs to be... better. There are two ways you can pull this off:
1: Make a mountainous valley with a path spiraling downwards with water flowing into it.
2: Make a tall mountain with water spiraling around it from the top to the bottom.
Both of these can still be playable if you have a wide enough ledge for both the rapids and walk-able ground. This isn't as easy to pull off, but if you want to pull off good-looking spiral water terrain, that's how you're going to have to do it. Having flat ground with spiral water and caterpillar hills isn't going to do it.
On another note, my uncle got out of the hospital early and I've got my laptop back. So, everyone, you can start sending maps instead of screenshots, now, and I'll be able to open them. I'll make another video demonstration of the height tool this weekend. Try to get the hang of this by Monday when the next lesson comes out. It's okay if you still want to work on this even after the next lesson, though; you've got as much time as you need.
I haven't yet received an acceptable assignment, keep working people! (Some of you sent me pastebin links with unavailable files, so I can't say for sure if they were approvable or not... Send them again, please!