Minnetonka Cave (info 208-945-2407) Located 9 miles up St. Charles, Idaho. Open for tours daily, the cave provides entertainment and education. Among its features are large rooms and caverns, stalagmites, stalactites and other cave formations. Tours are provided daily from 10 am to 5:30 pm. Be prepared for over 400 steps going up and down. Jackets and sturdy shoes are recommended.