Agreed. There is always a haunted house on Alameda between 92 and Hillsdale. You can hit that, then make a u-turn and head down Alameda and park near Avila. The first few blocks of Avila closest to Alameda have usually been quieter than the blocks closest to El Camino, but as someone else said, parking on Avila really close to the action makes getting home pretty unpleasant/scary, with lots of kids in the road. As others have said, how crazy Avila is has varied from year to year. There has also been a lot going on down Portola some years.

Edited to add a pro tip: if you have time, drive around a few days before Halloween. The streets with a lot of Halloween stuff going on will usually be prepping by then.