Write hours of operation on the membership card
Woo hoo! School's out! Time to avail ourselves of the local attractions. Kim's hack is so simple, but makes impromptu museum (or store or library or zoo) visits so much easier:
I can never remember when Costco or the library is open, so I just take a fine-tipped Sharpie and write down the hours of operation on the membership card. Then I know exactly where to look when I want to know when to go.