Great spot because it's so secluded in the forest. There's basically zero traffic on the dirt road near the campsite. A lot of the trees around seem to be new growth. Great view of the stars at night!
There are at least 4 other campsite off this road at different points if you keep driving. Some of them are more or less level and more or less muddy. This one was the best, but there are lots of options. All of them are commonly used because there are ashes from fires. There's a moderate amount of trash at most of them.
Requires a Discovery Pass. I bought a day pass for $12 online since I don't need the annual pass. They tell you to write the date and order number in large print on a piece of paper and put it on your dash. No one came to check my pass though (in January, so it's the off season)
You have to take a dirt road to reach the campsite, but it is pretty well maintained. The only difficulty I encountered were two points where a few inches of road were a bit washed out. They were small enough that I could manage them alright in a 2WD van that had normal clearance. So most cars could probably manage them.
There's a small trail behind this spot that that leads to the creek, which is nice. Other than that, you can hike along the dirt roads, but there aren't any actual hiking trails that I found. I saw a porcupine for the first time while wandering one of the side roads! I didn't drive up to Snag Lake.