ART will drop you off on the Harbor Ave. side of the DL/DCA park entrances. DTD is on the other side of DL, so walk toward and past the park entrances and ticketing area. You won't have any trouble finding DTD. ESPN is almost all the way to the
Disneyland Hotel. It's on the right side of DTD as you walk toward the DLH, past the Rainforest Cafe and across from the AMC Theaters. You'll probably need at least 15 minutes to get to ESPN Zone from the transportation center with the crew you have, and that's not really allowing time to window shop at all the fun stores you pass along the way.
I do believe that ART goes at least 1/2 hour after park closing, perhaps an hour. You might want to check out their web site, but don't be surprised if some of the links don't work:
www.anaheimresorttransit.net or
www.rideart.org
Now go get some rest so you can be fresh for your trip. Enjoy!
Ruth (Calgal)