I do all my shopping during Phillies/Eagles games (especially Eagles- great for when it's extra crowded during the holidays). It's lovely.

I also like going to favorite hiking trails (I'm in Chester county so not really helpful for Philly dwellers unless you want to drive all the way out to the sticks to hike along the brandywine or something)

Honestly never thought about going to museums and stuff.. I might do the for the Barnes and see if it is less crowded but somehow I doubt it.

Also love going out to dinner/normally crowded bars during the Superbowl. Once went to Victory during the Superbowl and had the place to ourselves almost. I know I'm a heathen but I don't like sports or people 😅