Thanks for the feedback, it's strange how people will act like you're a Jerk for protecting your property.
DIED, you bring up a good point. The realtor that I worked with in purchasing my place mentioned the same thing about getting a damage waiver signed by people that use the pond. At this point I have stopped all (legal) access to the pond but at some point in the future I may modify that.
Does anyone here use such a waiver? If so could they post a copy of it?