Go to the Garden of the Gods to see ancient rock formations.
Drive down to the beach and take a short hike to see this amazing WW2 ship that was beached. It's stuck out in the water and looks like you can just reach out and touch it. When you drive down, be sure to go all the way, as far as you can. We stopped early and wound up walking for quite a long time.
Get a map from the Jeep dealer and go to find the petroglyphs. They are so unreal. You'll have to climb a bit, and you'll feel like you're in the middle of nowhere. Wear sneakers and sunblock for sure.