Is there a bicycle designed for slow riding? I enjoy my road bike, but recently my children have become old enough to ride, but still very slowly.  I'd like to be able to ride with them on all or mostly flat pavement, but the road bike just isn't pleasant for slow riding as it takes more effort to balance and isn't that comfortable.

What type(s) of bike is well-suited for very slow comfortable riding like this?
Any bike with a comfortable seat, upright riding position and low ratio gears.

This is pretty much the definition of a 'cruiser' style bike.

Many hybrids, less expensive mountain bikes and fatbikes would fit the requirement too.