If someone "roams " on your land and hurts themself in the process whos fault is it?
FL will enjoy this one!
We once tried to protect ourselves from scrotes by erecting a fence with a razor wire top. Two things come into play: (1) the height of the fence - the razor wire must not be within reach of someone standing next to the fence (2) the signs - there must be regular signs around the fence warning of the dangers. Needless to say, we abandoned the project.
To answer your question, the "fault" will be determined by the judge on the day. If you can prove that you took all reasonable precautions (undefined) to make sure that your land was safe, then you would not be at fault. Disclaimer notices around the place would help at all normal entrances and a marked path (using fence arrows) would indicate the safe routes. If someone decides to go "freeform" that's their problem.
In some circumstances, it may be advisable to produce (God forbid) a Risk Assessment. Sign it, date it, have it co-signed by a Notary and keep it on file.It shows responsible custodianship.
And always remember: the drink you are about to consume is hot.
Welcome to the modern world.