Did Charles Schulz ever visit CP?

I know he visited Knott's Berry Farm, but did he visit the then-new Camp Snoopy in 1999 at Cedar Point, even if his health was failing? Or did he at least visit the Cedar Fair HQ at CP with United Feature Syndicate executives there?

Are there any available photos online?

I don't know about Charles but his daughter Jill works closely with Entertainment each spring.