The simple answer is post sign and never ever allow anyone on your property - PERIOD.
People can be your best friend, your family member, etc. if they get hurt or want to scam the insurance company you will lose a lot of money fighting it.
There is ZERO upsides to allowing anyone on your property. I had a guy fake fall on my property and made an insurance claim and I went through HECK for the next three years in court.
Unless you have every stone picked up, every stick picked up, the ground laser lever etc. you will be considered negligent. Even if your insurance company pays they will drop you. Also, my insurance company had some clause in their paperwork and were considering not covering me because of that clause then the entire case would have been on my back.
Unless you want to start a "business' then get a LLC, proper insurance and those will cost you through the nose. My insurance was 30K a year.