I don't have anywhere near the experience with different parks that many of you here do, but I must say that I agree with those that have mentioned Bonfante Gardens as an underrated park. It certainly exceeded the expectations that I had for it. It's not for the real thrill seekers, nor is intended to be. It's exactly what it's presented as: A "family" theme park. Most of the rides, while maybe not all that exciting, are certainly amusing and fun. The gardens are absolutely beautiful and exceptionally well kept. The Quicksilver Express coaster is just sort of an icing on the cake. I don't know enough about coasters to know what makes for a good one, or a bad one, but I know what I like, and I like this one.
I don't think the park would be well served by trying to add more thrilling rides. It could possibly do with a themed log or raft ride, but other than that, there isn't much that I'd change about the park. It's small and cozy, with plenty of shade and plenty of opportunity to simply relax and take in all the beautiful gardens and waterfalls. I really, really, like this park. It's along the lines of the backyard that almost anyone would love to have, but without all the work.