Man + USA = Mission.

My man is in the States for the next ten days, and aside from writing him ridiculously corny letters for each day he's away and sending him a series of silly photos of my garden gnome (which he finds particularly repulsive) in a different place/situation each day, I've been wondering what else I can do to let him know I care (and, potentially unleash the fact I am possibly slightly insane). He doesn't seem to understand my need for vast amount of photos of all things USA, and as a result, I have a plan. He arrived in Philadelphia today, and when I called him he seemed a little dejected. I've decided, to ensure I receive plenty of photos to re-spark my love of all things American, to give him a Mission each day. Firstly, he's in Philly, then flying on to Boston, New York and LA/Santa Barbara. 

I've been googling Philadelphia like mad, trying to find things to add to his quest, but I am a little stuck for ideas. Does any one have some suggestions of places/things to see/do (and prove he's seen/done with photos) for any of those cities? As you can imagine, I've got a fair list going on for the days he's in *NY. 

* Attempting not to burst into hysterical tears at the fact he's there without me. Sob.