Everglades National Park
One-and-a-half million acres in Florida (US) managed by the National Park Service.
Each edition grades its towns against each other only.

Big Cypress National Preserve draws about 2.3M visitors a year. All of it lies outside: 9 places within 40 miles, none inside Marco Island. On the list: 2 state parks, 2 museums and a national park, among others. The trip to Edison and Ford Winter Estates is 50 mi.

One-and-a-half million acres in Florida (US) managed by the National Park Service.
The towns around it, and where to stay →
The map puts most of the 9 to the north.
Orange: Marco Island. Numbers: the best-known places, matching the list below. © OpenStreetMap contributors
These 13 are all within 60 miles.
One-and-a-half million acres in Florida (US) managed by the National Park Service.
729,000-acre area in Florida (US) managed by the National Park Service.
Historical museum in Fort Myers, Florida, USA.
Florida State Park, located in Estero Bay, USA.
Seminole history museum in Hendry County, Florida.
Ranked by how many people look them up, so the famous places lead and the local favorites follow.
Parks and trails in Marco Island →
Everglades National Park: Everglades NPS from Homestead, Florida, United States, Public domain · Big Cypress National Preserve: Gzzz, CC BY-SA 4.0 · Hertz Arena: Tthaas, CC BY-SA 3.0 · Edison and Ford Winter Estates: Rolf Müller (User:Rolfmueller), CC BY-SA 3.0 · Koreshan State Historic Site: Ebyabe, CC BY-SA 3.0 · Naples Zoo: Exupery67, CC BY 4.0 · Bailey-Matthews National Shell Museum & Aquarium: Invertzoo, CC BY-SA 4.0 · Naples Botanical Garden: scott.zona, CC BY 2.0 · The Baker Museum: CTNMM82, CC BY-SA 4.0 · Southwest Florida Museum of History: Ebyabe, CC BY-SA 3.0