I've seen pictures, I've heard stories, but when I actually saw Crater Lake with my own eyes, all I could think was "Is this for real?!?!"
Yes - water is THAT blue, clean and clear
Yes - you feel like you're on a different planet
YES - it will etch in your brain as one of the beautiful things you've seen. So go!
ps-> There's really not much by way of food, so bring your own. And tons of mosquito spray.