Hi Ken
I live in the West Kootenays
Once you leave the East Kootenays there is a lot to choose from.
Small provincial campgrounds up the west are of Kootenay lake around Kaslo are beUtiful some you can reserve some are first come first serve so pick your sites carefully and if possible pay the extra and reserve when you can as the campgrounds around the lakes in the west Kootenays are usually full for sure on long weekends and more than likely on most weekend during the summer months. In saying that here are some great choices.
For a beautiful, mountain ride along the old rail bed between Castlegar and Christina lake. The issue is it is up hill to approx mid point so what most people on the Christina lake side is get the outfit that does bike rentals on that side of the mountain do is they take you in a buss to the summit and you ride back to the Lake. The Castlegar side where you ride high above the lake, I don't know of a company that do the same thing on this side. Campgrounds at Christina lake are full so you have to reserve. Syringa Creek is on the Arrow Lakes and you can get a site, but very iffy with out a res. New Denver up the Slocan valley has a small community campground on Slocan lake beautiful spot. Summit Lake provincial campground just 15 km south of Nakusp can ride the rail bed down into Nakusp. I have my unit parked at three island resort so I could pick you up in town if you need a ride back up the mountains. MacDonald Creek provincial campground on the arrow lakes in beautiful, this spot is south of Nakusp 10 km. Another 40 km south of that campground is Burton and they have a beautiful community campground right on the arrow lakes as well.
Send me a message and I can fill you in a more details and more campgrounds if you like there are lots to choose from and not enough room on this page.
Soup.