After a storm as strong as Ike, many people who rode it out like to go out exploring or check out the damage and flooding and this is NOT safe.
There are many hidden or unexpected dangers that still exist with flooding and damaged buildings. Some of the biggest issues are impassable roads... even for high riding SUV's and trucks. Highways in the Houston and coastal areas are completely flooded and impassable. Imaging driving up a major highway and hitting water that you can't get around so you have to stop, make a U-turn and drive back down a major highway IN THE WRONG DIRECTION! Does this sound like something you'd like to try and risk getting hit by a car going 55 MPH in the proper direction because they didn't know that you would be coming the wrong way down a highway?
The issue of wading in flood waters is also VERY DANGEROUS. The water is dark and murky. You cannot see what is under it. The dangers that can be hidden in the water include things such as glass from broken windows, roofing that has blown off of houses and buildings INCLUDING SHARP ROOFING NAILS! There is also the threat in certain areas of alligators and snakes. And also large pos/clusters of our constant nemesis, the fire ant! A pod of floating fire ants can kill a person if they get caught in the cluster.
These are real dangers and there are not emergency personnel to respond to these situations right now, so please use sound judgment. Stay off the roads and somewhere safe and dry. There will be ample time to assess damage and deal with the after-effects of Ike (or any storm). You can best help the brave men and women providing relief efforts and dealing with this disaster by staying out of their way!