Ed,
Just getting use to the new forum and didn't realize we had this feature.
Part One, Our park is handicapped accessible from reserved parking to use and access to all facilities however to date I have not seen anyone in a wheelchair in the park. We do not have any special sighs for handicapped use.
Part. 2
Like you, I have not encountered any service dogs in the park. I can see a potential problem here bringing a dog on a leash into an area with dogs off leash. The leashed dog often gets very defensive and agressive when encountering off leash dogs. I have seen prople walking dogs on a leash and it seems to attract all of the off leash dogs.