Go cart riding near the pier in Pattaya. 1500thb gets you (5) 8 minute rides. Pretty fun, go carts are a blast.
Water parks, you've got the old one on the beach in Pattaya, 100thb/each or go to the one by Silver Lake, 600 thb/each 700thb for a Cabana. Always good depending on weather.
Dolphin Show, the Aquarium on Suk or you have Monster Aquarium a few minutes out of Pattaya.