Bald Head Island south of Wilmington. Accessable only by ferry, no cars allowed on the 6 sq. mi. island with paved paths for golf carts, walkers & cyclists.
For everyday group rides at home, we're lucky to have smooth country roads right next to an industrial airport complex where we park, hop on bikes and ride crossing only 1 moderatly busy road. Drivers also give us good space and wait for passing opportunities when there's an oncoming vehicle. We ride 2 abreast and because traffic is always light we don't get yelled at.....basically treated like a farm tractor.
EDIT: our group is usually 12 or less, I'm sure we'd hear some horns if we had a large group