A long time ago, there was just a tiny path here, so to see the bats on Congress, you'd have to jam in the path, stand above on Congress and look down on them, or across the street in that grassy cove (or a boat). Then the city built this cool little platform to see the bats.
You are going to need to be steathly about this one, it's a popular area. I recommend the "tie your shoe" approach.