Everglades National Park is about 1.7 times smaller than Big Island of Hawaii.

Big Island of Hawaii is approximately 10,434 km² (4,029 sq mi), while Everglades National Park is approximately 6,105 km² (2,357 sq mi), making Everglades National Park 58.51% the size of Big Island of Hawaii.
Tip: This to-scale comparison of Big Island of Hawaii vs. Everglades National Park uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Everglades National Park vs. Big Island of Hawaii

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