Rebooking fee is built into the computer as I was informed over the phone so $25 plus CA state tax cannot be waived. Don't miss your tour! They start on time! You will be left behind! The online reservation process was painless, however, the confirmation email receipt was missing some key details like the exact check-in spot inside Golden Gate Park. It would've been helpful to include that and a little map in the confirmation email so I can quickly reference it on the go. Of course, the information is all on their website after a few clicks in from the Home Page. Don't call the 209-379-2350 number in the confirmation email as it's no longer in service. Do call 844-967-4653 number listed on the website and select extension #5 for Mather Camp / San Francisco customer service. Another great activity in SF!