Two rivers, dozens of springs, and a couple of historic mills are the spine of the park. The Current and Jacks Fork are the obvious draw — float them from a put-in to a take-out, with or without a guide. The big springs are accessible by car and worth a stop in their own right; Alley Spring with its red mill and Big Spring with its colossal flow are the photographic standouts. Look out for the wild horses on the bottoms near Two Rivers and Broadfoot.