Bring the kids, climb a wall or tree while you're here. Do remember it's Topanga, so be careful of: snakes, poison oak on the opposite side of the opening, and check for ticks when you leave.
You'll find a small cylindrical cache with a small log, pencil and a few little bobbles for the kids. Take something small, leave something small. We'll be watching. 
Thanks to Tabo^2 & Enigma69 for being FTF on our first hide!!