My dogs aren't too picky--as long as they have tennis balls and room to chase them in, they're happy! For the most part, people seem good about picking up after their dogs and keeping an eye on them, a plus for me because although my dogs are friendly, they prefer to be left alone to chase their tennis balls than play with other dogs/be chased/harassed by other dogs...must take after their anti-social owner.
Only complaint is that after big rainstorms, the place seems to be flooded for days and days!