"Each of us has been designed for one of two immortal functions, as either a storyteller or as a cross-legged listener to tales of wonder, love, and daring. When we cease to tell or listen, then we no longer exist as a people."
You don't need an Official BookCrossing Zone to release books.
I leave books in dozens of places (restaurants, hospitals, coffee shops, food pantries, schools, waiting rooms, Little Free Libraries, laundromats, etc.) , only 3 of which are OBCZs and unfortunately I don't get to them all that often. Don't let the lack of OBCZs stop you from enjoying releasing your books.