A weekend in San Francisco can be full of surprises.
I spent a week in San Francisco when I was in Junior High for a school field trip and we visited Alcatraz and Ghiridelli Square (we had to learn just enough for it to be supported by the school, of course).
In High School, I went to California twice for Spring Break music trips.
In 2007 I stopped in San Francisco while moving from Virginia to Washington State and visited a friend.
Each trip was very different.
Recently, I visited another friend in San Francisco and saw two neighbourhoods that had been left out of my previous trips.
Mission District and Casto District are very distinct and different neighbourhoods, but both hit the spot and left me happy and satisfied.