Can't go wrong at williwaw. One of my favorite campgrounds in alaska. Been there about 20+ times and always try to camp at williwaw. Very clean and lots of hiking and beautiful views. Never had problem with crime there, but like anywhere else, just keep things locked up when you aren't there.
Very often see bears and moose there. Be sure to visit the visitor center nearby and watch the movie. Very nice area--don't miss it