Shots that couldn't be anyone other than Spider-Man. Just swap over to the Dusk time mode, line up a shot with the setting sun, and snap some of the coolest pics in the game.
It's also worth commending how detailed the streets and pathways of New York are. We've come a LONG way since Spider-Man on PS1 couldn't render streets at all, instead swapping them for a poisonous, all-obscuring fog.