Pear City - 375MB World
You need 3.3.0.
Before you log in, go to options, version, select 3.3.0 or latest version, log in, if it asks to update, update. Then come in.
A 375 Map with a city (3 boroughs), a small city in another part of the world, 3 other towns, economy, roleplay, shops, elaborate cart system that you can ride, morse code, nuclear power plant with wireless alarms, redstone wire power, solar tekkit power, nuclear tekkit power, houses, and much much more.