Always carry a whistle and a cellphone, a knife isn't a bad idea too, plan for an emergency. Get to high ground if possible, at least out of the gator slide areas. If forced to stay overnight try to get elevated if possible. Don't lay in vines, try to stay on the trail. Always let someone know you're at the trails and if they haven't heard from you by nightfall to call for help. I'd imagine a cage in the lot after hours might indicate to the land managers that someone is still out there.