To be fair, you need bikes to do the bike ride, you need to know what days the museum is open for free (which is often couched as PWYC, and it’s unclear whether the amount can be $0), and even going to the park with food requires food—like, you can put your extra lentil soup in a Tupperware and schlep it to the park, but if you want to do a picnic you need to buy picnic food stuff.