A couple other thoughts...
You can go down into the area below the hills, which is fenced off. I've had a ranger give permission before, with the caveats to stay completely off any of the features and to be considerate of others photographing from above. You might double check with the ranger when you're there to make sure, but consider that as an option. Secondly, the hills are much more colorful and saturated when wet, but the clay in the basin turns into absolute gluey muck. Be prepared with a second set of shoes or boots.
Here's a couple more pics for you.


