What are your favorite permit free rivers?

So iam looking to expand my horizons and after a zero for four lottery am wondering how I can stoke the flames and do more rivers anyway. Were in montana and will do our permit free rives but permit free will mean crowds and road side and of course we paddle within our skill level so... what are some of your favorite rivers that do not require permits? Can you multi day them? Is the camping reasonable? Available? How's the details to your secret spot go? Lol! So how about listing the pros...

What are your favorite permit free rivers?