If you want to make a small fortune, invest a large fortune in this.
A mt bike park could bring in a few hundred thousand a year if all goes well. The debt service on a $13.5MM loan plus operating costs would be juuuuuuuuusssssst a bit outside of that.
However, if you are a lottery winner, CA real estate speculator who has hit it big or s crypto millionaire that may not be important to you.
I used to live on the Daley Ranch not far from there...that area is near and dear to my heart - buy it and keep it open!