Here's a look at the overlook to the largest, deepest point of the Grand Gulf.
(Check out these pictures of the entire valley filled with water in May, 2011)
This is the view from the overlook above. It's 130 feet to the bottom.
The cave continues on the right of this picture toward the east, southeast. It's plugged with trees so don't get any ideas.
On the other side of the canyon sits this trail. As you can see the warning on the sign: "This trail descends 70' using 119 steps."
The bottom step below is the 119th step on the trail. The rocky overhang is a bit spooky.
Another view of the south canyon and trail.
A small, trickling waterfall can be seen in this picture near the end of the trail. The water falls about four feet to the loose rocks and there the water quickly disappears.
On the web:
Grand Gulf State Park on Wikipedia
Missouri State Parks' Grand Gulf page