You are indefinitely going somewhere with no internet access (not necessarily a deserted island). You happen to have your Top 5 favorite Superman trade paperbacks with you for potentially the rest of your life.
Scenario has only 3 ironclad caveats:
1. The selection has to be already officially collected in some fashion.
2. Each selection has to tell a singular overall story with a beginning and an end (no anthology-style formats, aka no "Superman in the ___ decade" collections, no "Greatest Superman Stories Ever Told" editions, etc).
3. No single-issues
Mine, right now (subject to change).
1. All-Star Superman
2. Whatever Happened To The Man Of Tomorrow
3. Reign of the Supermen (no Death of Superman, no Funeral For A Friend, unless a single omnibus edition already exists that covers all 3)
4. Birthright
5. Lex Luthor graphic novel
Yours?