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You won't be able to completely keep people from trying to go after the owners if somebody gets hurt. However you can make it easier and less likely that it will ever reach court... put up signs that say 'No Trespassing' that way if somebody does get hurt then it was done while trespassing and IF they decide to sue for injuries or whatever the owner can counter sue for damages to the property and for trespassing. It isn't a friendly world but that is the problem people come across regularly in today's day and age.