Here is a July 17, 1983 article titled Sesame Place: Everything is really (rubber) ducky at the (cookie) monster of a children's attraction:
Ernie (as well as Bert and the Honkers) had debuted in 1983.
Nice shot of the Computer Gallery:
This must be the Cookie Monster "Automated Muppet" that debuted in 1982:
Here's a great shot of the (still standing) Monster Maze: