I saw him once on the back street at the Studios where Millionaire used to be (and I think One Man's Dream still is). They used to have a lot of character greetings in that area, so I don't know if they've moved them now that Millionaire's gone and there's construction going on.
Also, if you ask a cast member and they're not too busy, there's a number they can call to find out where certain characters will be in the parks that day and when. Good luck!