Kim at All of My Faults Are Stress-Related is interested in mud pictures, so I'm posting a couple photos of the mud flats in the Turnagain Arm, Alaska, fjord. In these photos, the tide is going out.
The first two photos were taken on AK Route 1 near Beluga Point looking southeast and then southwest; the third photo was taken on the same road between Bird Point and Girdwood, looking east.
This is the kind of mud you shouldn't venture out on at all. Every year, people get stuck in these mud flats - the tide will then come in, often way over a person's head. The only way to get a person out of this mud is to have the fire department come, quickly, with high-pressure hoses, which blast water all around the stuck person. The water supposedly makes the mud thin enough that the person can then walk out, but I think that ropes may sometimes be necessary. Any rescue has to be accomplished before the tide comes in, sometimes with a tidal bore of 6 feet high at speeds of 12 miles per hour.
So, just don't go there (onto the mud flats). A 2005 Geotimes article describes the tidal bore and some other points of interest in Turnagain Arm.