Every U.S. National Park

Every national park in the United States, planned realistically: drive to each gateway, fly or ferry out to the park, and come back to your launch point before moving on — no teleporting between roadless parks. Start at Key West (ferry to Dry Tortugas), fly to the Virgin Islands from Miami, drive the lower 48 (with ferry hops to Isle Royale and the Channel Islands) up to Olympic, then drive the Alaska Highway. Fly the Alaska bush parks round-trip from Anchorage and Fairbanks, ferry into Glacier Bay from Juneau, and cross the Pacific through Honolulu to Hawaii and American Samoa. Copy it and take the leg you can manage.