I've seen a few areas on the various sims where people have made part of their land open for all to roleplay at, and I thought it'd be handy to list them all here. However, I'm specifically talking about the unmanned areas that the rest of CD is free to use for whatever they wish (probably aside from just burning it down..), created by residents of CD whom probably just needed the land for extra prims, but are not part of any specific roleplay storyline (or are, but again, aren't manned by any particular player).

VODOU:
The Gorge (East end, public swimming shore)
Miley's Park (SE area)
Large Pond (East end, no name)
Trinity Church (North end)
Motel (North end near border of Hathian)

D8:
Apartments (no name)

BLACK BOTTOM:
Haunted House (West side, along FT border)
Louis' Italian Restaurant (just North of CU campus)

DEVILS POCKET:
Church (East side)
Run down park (South side)
Chaos Arcade (Central area)

FISHTOWN:
Family Park (not including the house)

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Other player-created areas that have a group in charge:

-- Aces High (Strip and Sex Club, ran by Ace's Crew, central area of Devils Pocket)
-- Val's Pub (bar, ran by Valmont Marseille icly, but open for NPCing bartenders 'n such, North side of Black Bottom)

And..
-- Jimmie's Chicken Shack (West side bordering Hathian; CD owned, though no rp group in charge, & underused!)