We tried it for the first time with DD aged 5 in October and had a fun day.
The kids area is ideal for younger kids (DD was too big for some of them - so definitely pre schooler age) There was a water play area she liked - take swim stuff.
The animals, the train around the park, the safari ride. She liked the Air grover coaster (like shamu express) - went on about 20 times.
The characters are sesame street which DD didn't know (meanwhile i'm going WOW IT'S BIGBIRD!)
The biggest perk - going mid week in October was it was super quiet. She was the only one on most of the rides and could ride over and over again. I could sit and watch her in the play area without losing sight of her.
Park was open 10-5 and we stayed all day and didn't do any of the big coasters.