That is a great policy for the park in Smithville Dan. That should be the policy at all the public parks.
No alcohol and bottles is the policy for most any
park in the US. The issue is the local man/woman power to enforce it.
I have been on many courses in many other cities and usually check with a local player. Cans are usually tolerated, but you should keep them contained in your bag, but technically even that is in violation. A cooler is a dead giveaway and could lead to inspection, confiscation, fines or arrest.
Most local enforcement is fairly tolerant as they see the disc golf community help drive out the undesirable.
Some are more bored and feel warranted to enforce, i.e Shawnee Mission Park
Be not paranoid, but be aware.
PS: Yes we should can CD, he has a full body with a hint of frothiness. But then again, nobody would buy him.