I have learned from Ed, one our GCC Volunteers that the YMCA on the south side of Archer Road has given permission to park in the grass adjacent to their paved parking lot.  I am told that the YMCA is "a baseball's throw" from the intersection of SW 91st ST and Archer Road. (See the link below for a Google map).

Please note that they are giving permission to park in the grass, not in their paved parking lot.