[Ursa major]

I read Ringworld and I think (it was a very long time ago) I found it satisfying in itself (although I wanted to know more). I do recall being blown away by some of the ideas, including the ringwold itself.

Later, I read The Ringworld Engineers, which was fine. I've never been able to get more than a few chapters into The Ringworld Throne; perhaps if I read it immediately after the other two, I might build up enough momentum to get into it.