Having just spent my first weekend at #47 last week, I would have to say that I would do it solo but be very careful. It is a tough hike in on a pretty established trail but there are a lot of rocks and it would have been easy to turn an ankle, especially on Sunday after the rain. The river itself though is tough to navigate at times because of the size of the boulders and amount of water that flows over them. An accident on the river would almost surely leave you stranded as the trail only crosses the river at the campsite and never follows it.
Oh yeah, and there were the bears playing banjo music.