It would be cool to meet him. I'd ask him to autograph a copy of Ringworld but only if he made his signature circular.
I've read some criticism of Ringworld in this forum...hey, that's cool, I have certain things I always crack on. I must say that Ringworld was one of those books that inspired me to read a lot more. After recently finishing everything by Alastair Reynolds, I started reading his recommendations. Revelation Space was another one of those books that inspired me to read a lot - that was totally mind blowing. I love it when the writer takes my brain out, twists it around, and stuffs it back in. Next up will be Pushing Ice, just because.