You have a lot of hills to choose from in San Francisco but in my opinion the best (and most varied) views are from Bernal Hill. Bonus: from my kitchen table I can watch tiny blobs moving around on this hill-- slow blobs are people, fast blobs are dogs.
Here is another place packed with visual stimuli, along with weird smells and busy sidewalks. I love roaming through all the shops, venturing deep down the aisles to hunting for all things odd and unknown. So much to see, I wish I had extra eyes!