At this time of year there's quite a bit of fruiting and flowering going on among the cactus. My mother used to make cactus jelly when I was a kid living in rural Arizona, and it makes my mouth water seeing the nopales
Walk past the Stanford Family Mausoleum - A lovely spot - And head vaguely west to the cactus and succulent garden. http://bgm.stanford.edu/groups/grounds/special/arizona
The garden is not heavily visited - though it has a regular cadre of visiting walkers and dogs.