Funny as it sounds, there isn't much organized camp grounds in the area. There's Big Water http://bigwatercampground.ca/ , but they don't have showers. It will take you about 10 miles out of your way. The Esso Truck Stop (you'll pass by on your way to Kamiskotia road, which leads to the trail to Smooth Rock Falls) offers free showers with a fuel purchase or $5.00. I have my bike apart right now, but if I get it back up tomorrow, I'll check out a spot just off the road to S.R.F. that I remember seeing last year. It isn't too hard to find and is right beside a river. I'll let you know If somebody has claimed it. If it isn't claimed I'll give you directions with a pm.