Good luck fellas, unfortunately I wont be able to join in, am leaving for Umrah tomorrow.
As for the above pictures of the light house off Keti Bunder. The area close to the water line is (green patches above) are mostly marsh land and swaps. I wouldn't explore that area in a 4x4.
You will find alot of places to offroad off the Canal Road (shown above), just make sure to stay away from the Abu Dhabi Hunting grounds.
As for Mubarik village & surrounding areas, they are a no go area these days due to recent kidnappings.
You will find a check post just off mauripur road (after bilal hotel, chain toll) and there's police there that doesn't allow non-residents going through.
Be safe there.