Plan ahead to see the old signage. The neon boneyard is only viewable through tours. Buy tours in advance because they sell-out before the tour date.
$18 might seem like a lot for a 1-hour daytime tour, but it's worth it to see the iconic graphic design. A couple bucks can be saved by getting a combo ticket with the Mob Museum, located 0.7 miles away. There is also a more expensive night tour where some signs are lit.
Although the signs seem scattered around the junkyard like an "American Pickers" nightmare, they are deliberately positioned and easy to see. It still causes concern. If an automobile museum displayed their unrestored cars this way, we'd be horrified as it would look like the set of "Sanford & Son".
The signs are outdoors in the blazing sun. Keep this in mind when visiting. It also makes me wonder why the signs aren't better protected from exposure - even something as simple as an open air hangar.