Alaska is good but very cold. I recently did a 2 week rafting trip down the Grand Canyon. Camping every night. Floating on the river every day. Hiking every now and then. Cell phone doesn t work. No electricity. No running water (except the river.) You do have to go with a group and you have to book it a year in advance. I recommend the company I went with, Arizona Raft Adventures. It was fantastic.
New york state- the adirondacksa private property with private cabins is really secluded.
Denali National Park in Alaska.
The wilds of Alaska. many places you have to be flown in to and flown out again.
what kind of weather are you looking for?