Imaginary Conversations and Random Thoughts

Ok genuises, help me out here. A small condominium association with 18 units and a swimming pool has some concerns about liability The pool is completely surrounded by a six foot high fence, with locked gates. The remainder of the property, aside from enclosed patios for each unit, is unfenced. Neighborhood children are getting old enough to roam on their own, and some have taken to walking across the property at various points, doing whatever kids do. Do No Trespassing signs protect the association from liability? Any tips or insight are welcome.