"Dh said no more parks" Huh?
Must have been a bad experiance at another park.
BGT has something for all your kids.
I'll give you some advice. Split up. You take the 4 year old, and let the DH handle the older kids.
For the 4 year old, there's Land of the Dragons. A play area for little kids that has crawl nets, a bounce house, and some kiddie rides.
While you and the little 4 year old are stuck here (believe me, the kid will not want to leave), the DH and older kids can go ride Kumba and the other thrill rides.
Pick an exact spot at Land of the Dragons. Set a time, and split up. This way, you have a break apart from each other. Dad and the girls can go on the thrill rides. Let him have a couple beers at the hospitality center, they're free. Give him some space. The girls can meet the height requirements of the thrill rides.
Have him meet you at Land of the Dragons and then let him pick the place you eat for lunch. He'll be happy after having a couple beer samples. I recomment Da Festhas, it's the German restaurant near the back of the park with a show. There are a couple kiddie rides, and some thrill rides nearby. Plus, the Dh can buy another beer at Da Festhas to make him happy with lunch. Just be sure to tell the kids they can't play the games. You'll walk thru a bunch of them while heading towards the restaurant.
There is a dolphin show you can all watch together. Then you can take the sky ride over to Kumba to see the animals in the Safari exhibit. It's a walk thru zoo where you see the animals close up.
If that doesn't make him happy, then let him have another beer at the colony house.