Seclusion means being separate, and apart from others, in a quiet kind of way. If you want seclusion, try a private island.
The word seclusion implies privacy as well as separateness. An island with no other islands around it or a cabin in the middle of a forest will offer you seclusion if you need to get away from other people. Some nations have a policy of seclusion — they do not allow people, products, or ideas to cross their borders and enter the country.