Question:

How many acres (or square miles) of public land are there in Leelanau County, including the Fox Islands (not shown)? Get within 5000 acres (or 8 square miles) and consider yourself a winner.

Clues:
A square mile is 640 acres. The land area of Leelanau County is roughly 375 square miles. Sleeping Bear Dunes obviously adds to the 'public land' total.