Honestly you couldn't pay me to go next week, madhouse galore, not to mention Saturday is free (so technically I guess you'd be paying $50... $25 x 2 tickets)
You can check MUNI's webpage for a list of buses that run through it, you MIGHT be able to park in the park if you get there early. Usually before 9am is almost guaranteed a good spot, but if it's like Rich says where people will be lining up at 6am to get into the place.... maybe not.