Every month or two I make the trek to the local bank to get some $1 coins for the laundry in our apartment complex.
Aside from that, I use Apple Pay for nearly all in-person transactions, PayID for sending money to friends and family, and my credit card online.
I'm approaching 30 and haven't actively carried cash in over a decade.
I'm personally not a big fan of those renditions and agree that it will take away from the park area.
But at the same time, I can't think of a better way of doing this and it desperately needs doing.