Bermuda
This is a roughly half-sized replica of Bermuda, inspired by my recent visit. This map has no incoming roads/rails, only sea and air; but you start with a port at historic St. George’s harbor. (The starting port can be bulldozed later on)
I put in a few landmarks, like notable forts, lighthouses, and graveyards.
Suggestions for replicating Bermuda:
-no highways, all the roads are 2-lane!
-left-hand traffic
-transit is primarily buses and ferries. (and historically, a passenger tram line)
-download all the churches you can, Bermuda has the highest church density on Earth!
-consider high-rise bans
-real-life Bermuda runs on oil power plants and imported oil, but solar power is in the near future.
Enjoy!