You have been sentenced to life in a micronation of your choosing (Sealand, Molossia, etc.) The micronation must have actual land and you may never leave that land. What micronation do you choose?
Edit: clarification of the rules. A micronation is by definition not recognized internationally. As a result, small sovereign states like the Vatican are not allowed.
Also you can’t just make your own micronation wherever you want. It has to already exist.
Seborga! Been there often.