This is a weirdly-worded question, but I take it to mean what is the most commonly-visited national park. If so, the answer is Blue Ridge Parkway.
They are on islands.
The National Park Service
Everglades National Park and Biscayne National Park are the most popular national parks in Florida.
yellowstone is of the most popular national parks
Minnewanka
It is jenaral sharman. It is located in the national park of California.
Both Kobuk Valley National Park and Gates of the Arctic National Park in Alaska are more northerly. Denali National Park is the most northerly US National Park connected to the continental road system.
Kluane national park
royal national park
UNESCO World Heritage Site
Ellesmere Island National Park also known as Quttiniraaq National Park
RAJAJI NATIONAL PARK IN INDIA IS A COMMON NAME OF A FAMOUS NATIONAL PARK.