Blue's Clues is not a Disney property, it is Nickelodeon. I'm not sure any of the theme park operators have a Nick license. I know the Paramount parks used to, but Nick was dropped in favor of Peanuts when Cedar Fair purchased those parks.
It's a shame, because we live close to one one of the Paramount/Cedar Fair parks (Kings Island). My granddaughter loves the Nick characters (Dora, Spongebob, Blue etc).
There is a Nickelodeon theme park inside the Mall of America near Minneapolis. That doesn't help anyone whose going to Orlando though. In fact, I looked into possibly taking my granddaughter up there this summer (we're spending a week at Wisconsin Dells over Memorial Day). But it's still a seven hour round trip from the Dells.
Aw, boo I was hoping that maybe at Universal or something there was a M&G. I know its not Disney but we'll be in WDW in July and I thought maybe. Thanks though!