A nice site that is well kept and clean. There are dedicated car camping sites ($20/night) that are ALL first-come first-serve, so make sure to come super early to secure your site! There are also 3 sites dedicated to those without vehicles (bicyclists/hikers) and those are only $5/night.
This is right on the edge of Lake McDonald which is a nice cool temperature, and there are dedicated bathrooms and portable water pumps. Furthermore since there are no electricity hookups and no areas for RVs, then it's also nice and quiet!