Follow the rules

I forgot I had this photo. It's a sign in the ecological park in Shekou District, Shenzhen. For anyone wanting a pleasant day away from the noise of the city, this park is beautiful with views of downtown Shenzhen. There usually aren't too many people, so it's not too difficult to find a peaceful spot to relax, read, write, draw, etc.
However, please obey the rules of the park. Pay particular attention to number 6.
I'm still scratching my head, wondering how exactly one would practice feudalism in a public park. Would someone build a castle and then rent the public land to some peasants?
I've been thinking of getting a group of friends together and holding a medieval picnic. Everyone can dress as lords and serfs. Of course, the serfs would have to give half their food to the lords who would arrive with nothing because the serfs would pay for everything. It can be a fun day for the whole family. Abuse the peasants and eat their food!