For those that are new to Miller Canyon, make sure to pick up an adventure pass for parking. The meter maid tickets freauently on weekends. The three most convienient places to purchase are at at the Shell on Cajon Blvd, just west of the 138 offramp, or at Chevron or AMPM off Sierra in North Riatlo (the exit before Glen Helen).
Passes are $5 for a day pass or $30 for a year. Also, if you corridinate with others you can save by purchasing a year pass and getting addition vehicle passes for $5 a piece. So you could get get four 1 year passes for $45 and split the cost equally at $11.25 a piece.