Wow, you work fast
.
Let's see...can never have too many bushes and trees, though I can understand that those might not be quite so interesting to make
A fire pit (how could I forget a fire pit?) - thinking rocks stacked in a small ring here
An
EZ-Up or some other sort of wooden shade structure
A fallen tree or two (they're great for sitting around the fire)
And if you aren't thinking too remote, you might do electrical/water hookups and an RV/trailer or two.
And of course, there are always signs - "No dogs on trail", "All dogs must be leashed", "Mountain Lion territory", "Rattlesnake territory", and some generic wooden bulletin boards/ kiosks and trailhead markers.
Diggsey: I have a spine and memory, but one memorable guy says he hates me. What am I?