Nope, same rule applies as other day trails. You can park in the parking lot from 7am to 11pm I think it is? That day pass is good for anywhere in the park (excluding the obvious areas with posted signs). If you want to park overnight, you need a different permit. I've done quite a large chunk of the High Lands trail without actually back packing myself.
Current Topic - Highlands Backpacking Trail - no backpacking