Within 15 min. or so of JTNP, farther depending on where in the park you're going/coming from. I camped here Thanksgiving week. There are established sites all over the place, all along plenty of side roads. Saw mostly RVs, with very few tent campers, like myself. No vegetation above maybe 1m, so you're well within sight of everyone and vice versa. Not much of a problem when it gets dark at 5pm, but there's campsites along Sunflower Rd., I believe, with portable toilets if you're tent camping and can't find a concealed spot to pee, though I didn't have trouble. Main roads are pretty busy; people get in at all hours, but I noticed most people were driving farther into the lakebed. Don't expect to feel very isolated or solitary out here; expect to wake up to more people around you than you thought. Roads go from bumpy to pretty rough--be careful if the first time you're driving here is in the dark (I was in a Jetta, granted). I showed up after sunset every day and easily found a spot on the outskirts. It was noticeably cooler here than in the park--each morning I woke up, my car was saying it was at least 10 degrees cooler, 20 one morning. I ended up getting out of there first thing and cooking breakfast in the park to be a little warmer. Easy to find, and it works if you're just looking for a place to rest for the night.