I am including a photo map of the Seven Bridge Walk which starts in Balboa Park and loops around thru Hillcrest for 5.5 miles. It is such an interesting walk and I went with a Y group and our leader had the write-up of the history of each bridge. The Spruce Street Footbridge is indeed a swaying one. Best to just google it and get all the info if you want to do the whole walk. It makes for a good activity for a group or I will definitely do it again with a friend or even solo.