Unfortunately not. Basically if it isn't suitable for a very small child, it isn't safe for preggos. Sorry
Just chill in the lazy river... I had to deal with the same thing going to Hershey Park. Oh but the sacrifices are so worth it. The rides should have signs that tell you whether pregnant woman are allowed are not. Most say no preggos allowed. I also walked around picking out on food... Yum.
You can't do waterslides. Anything that is forcing pressure in the opposite direction that is natural could harm the baby. If you go on their website and look at the restrictions for each waterslide, more than likely it says that pregnant women should not ride. I was hoping to go to Kalahari when I visit home at 26 weeks and was so sad to see that every ride (including the wave pool and lazy river) were off limits for pregnant women.