Hunter, the first go anywhere game I played, you can drive/ride/fly all vehicles you find, be they tanks, boats, hovercraft, various heli-copters, push bikes and even wind surf. upset the PC brigade by shooting/running over Cows, Rabbits, Seagulls and Sharks. mind..... those cows can also attack when your on foot :-)
screen shots
http://www.emmitt.fr....uk/hunter.html