I haven't played a game this much in a single day in ages. Story seems to have moved to the final island. Haven't really touched challenges yet, just story missions and a ton of exploring. Have about a third of each collectible type and I've spent hours just traversing and stumbling on them.
Once you get all your moves (air dash, the super bounce) traversal in this game is just wonderful. Quick, responsive, and involved (in the best way). I've seen the traversal called "simple" but I don't think that is accurate. You'll be pressing RB, X, and A in every combination imaginable to get around the city. You're never going to be unable to get somewhere because the controls are difficult but moving through the city skillfully does take some learning.
Getting to the top of your first building in Infamous Second Son is a great rush. So fast! But then you're met with the sad realization that its just too easy to zip up every structure. You have to work to climb in Sunset Overdrive but it feels so good.