Image from Vintage_ads
Above is a magazine ad from1988. In addition to giving us the chance to save $3 (from May 7 to July 8, 1988) it mentions many attractions including Sesame Streak water slide and Ernie's Bed Bounce.
It also mentions the debut of Sesame Neighborhood, the outdoor Sesame Street replica set. There was already an indoor one:
Images from YouTube
Also, the ad mentions two new walk-around characters: Prairie Dawn and Grover.
Sesame Place still distributes coupons like this today and you'll save more than $3:
Of course, admission prices were different in 1988:
$14 for children, $12 for adults. Children under 3 are admitted free. Parking is $2.50
Single-Day Admission $57.99 (plus tax)
Children 23 months & younger FREE
Seniors (55+) (single-day admission only) $52.99 (plus tax)
AAA Walk-Up Discount (with valid card) $54.99 (plus tax)