We determine when the Hopf vector fields on orientable real
hypersurfaces $(M,g)$ in complex space forms are minimal or
harmonic. Furthermore, we determine when these vector fields
give rise to harmonic maps from $(M,g)$ to the unit tangent
sphere bundle $(T_1M,g_S)$. In particular, we consider the
special case of Hopf hypersurfaces and of ruled
hypersurfaces. The Hopf vector fields on Hopf hypersurfaces
with constant principal curvatures provide examples. The
minimal ruled real hypersurfaces form another class of
particular examples.