The Annual Reiter Trails cleanup is Sunday, May 1st starting at 9am. You don't need a 4wd to help out, sign in before 9am, and spend a few hours collecting trash.
Last few trips I've been on up there was surpirised at how little dumping had gone on, but there is still lots of "party supply" litter, and the occasional dumped vehicle.
(Just a notice here for those that haven't heard yet) ...