If you want a relaxed ride, how about a Raleigh International. They are expensive but are a road bike at heart.

If you want a used mountain bike (no suspension front or rear). They are available everywhere. They are inexpensive (~$200-$300), easy to ride, comfortable to ride road bike. Put some Schwalbe KOJAKs on it and ride to your heart's content.

The frame geometry is stable and twitch-less. The tires can be "cushy" at low pressure (40-50 psi) or fast and road-like at high pressure (70 psi). Cantilever brakes are powerful and controllable. Saddles either fit or are easily changed.