The stadium has finally been made as well as a few other stuff! The screenshots have also been updated with the stadium in the background. I hope you guys enjoy the update and please recommend some more stuff to the park, tell me your feedback, and subscribe to my channel! 
P.S.- remember to get the current/recommended download! That is the download that has the updated map!!!!
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Here is my honest opinion on the map:
I thought it was a very small, but enjoyable way to waste a couple of minutes that was charming and actually kind of incredible if you built it all by hand without commands or mods. If I was to give it a score from 1 to 10, it would be a 6.5. (If you actually built it all by hand, then I would give it a 7.5.)
If you aren't using mods or commands than I recommend to start using McEdit or WorldEdit. The commands work, but they are kind of a pain. I use McEdit for my maps and overall it's a very nice program. I'm getting of topic. Anyways, I thought this map looked very interesting and "cool" at some parts and I'm definitely interested in what you have to offer. If you make more maps, I'll play them. :-D
By the way, The horse race was the best part, by far.