I know the trails real well, have lead a few trail rides down there, but sundays are no good as I work Sun-Thurs. Aug 15th might work for me. Its been a while since I have been there, but would love to go back soon.
Also its a good idea to stay off the game lands. They will fine you. Last time I was there, there were survey markers so you knew what was what. But, like I said, it has been a while.