So, probably a little late for this reply but, there is only 1 county in the Panhandle (that I know of) that you can drive on the beach but, you need a pass and its on a lottery system. Alternatively, you can take a ride to Niceville, FL hit up Jackson Guard and get a Range Pass for Eglin Range. There's a lot of really cool trails out there and some sand pits. Hope this helps for your next trip over this way!