I did not relocate the Acorn Woodpecker while I was at the park between 11:30-12:00. The other birders that I talked to had not seen it either, but I didn't spend a long time looking today.
A Long-billed Dowitcher did fly by, calling. It eventually landed on the shore of the pond directly north of the parking lot where the Acorn Woodpecker has been seen.
A photograph of the Long-billed Dowitcher can be viewed here:

http://www.flickr.com/photos/crappywildlifephotography/5055263218/

Rick Hibpshman
Issaquah, WA