Yeah, that is a good hike!
As far as your Civic goes; I'm not sure, I haven't been down that road in a while. The last time I drove it, a ranger stopped me and told me I'd never make it in the Taurus I was driving at the time. He didn't know me very well; unless it's ridiculous 4WD, I can get any car anywhere. There was one spot, towards the end of the drive that was a bit rocky and your Civic would likely scrape there, but with some careful driving and maybe some strategically moved rocks, you could probably make it without leaving your oil pan or exhaust system behind.
"I'm not a vegetarian because I love animals; I'm a vegetarian because I hate plants." A. Whitney Brown