I have lived near Hemlock Ravine for 1 1/2 years. I love the peaceful nature of the park dearly and walk my dog there frequently. However, make note that there is only ONE off leash trail for dogs - Governor's Trail. I'm sure most dog walkers that come to the park don't know that or they don't care. My dog and I have had our share of scares and close calls with other dogs which are walking off leash in on leash areas. Very frustrating. And yes, there are people who don't pick up after their dogs or pick it up and leave the bag on the trail for someone else to take out. The peace and quiet I feel when I visit the park is slowly being eroded away by insensitive dog owners. I hope you enjoy your visit there as it is a lovely spot.