Image from Mid Cities Daily News
Kids would swing on a rope across a series of small hills (that resembled speed bumps.)
1983 Image from Flickr
At some point the attraction got a green tarp roof:
Image from the Sesame Place Facebook page
The kids could push off on each hill to propel themselves to the other side.
Image from Picasa
Today the footprint of Twiddlebug Hop is a walkway between Sesame Playhouse and Mr. Hooper's Emporium.
Image from Google Street Views
Many thanks Jeff Davis, VP of Operations at Sesame Place, who was able to tell us the title for this attraction after some speculation yesterday.