I am planning a rafting trip for my brothers and father. We know nothing about rafting, so we need a guided trip. There are six of us total. Interested in something 3-5 days. The more remote the better. Would love to have a private trip but my internet searching shows that is unlikely (usually min group size of 8-10, and not sure we are willing to pay for seats that we wouldn't fill). Trip will probably have to be in Sept due to schedule coordination. Any recommendations for rivers or outfitters? I am based in Spokane, but everyone else is scattered around the country. While it would be nice to be reasonable driving range from Spokane, we would consider farther. Thanks!