Games Like Totally Mayhem

A huge city. You can drive cars, taxis, helicopters, vans, airplanes, many other vehicle types, shoot from turrets etc. Complete missions, shoot with many weapons(pistol, shootgun, missile launcher, grenades).
Each mission is unique, in some you will have to kill a number of enemies or a number of enemies vehicles, in some others you will have to kill a boss, in others you will have to race.
You can jump from building to building, shoot barrels to provoke chain explosions. But be careful, there are plenty of enemies that you will have to destroy.
This game is a Totally Mayhem