  In earlier work we have shown that for certain geometric structures on a
smooth manifold $M$ of dimension $n$, one obtains an almost
para-K\"ahler--Einstein metric on a manifold $A$ of dimension $2n$ associated
to the structure on $M$. The geometry also associates a diffeomorphism between
$A$ and $T^*M$ to any torsion-free connection compatible with the geometric
structure. Hence we can use this construction to associate to each compatible
connection an almost para-K\"ahler--Einstein metric on $T^*M$. In this short
article, we discuss the relation of these metrics to Patterson--Walker metrics
and derive explicit formulae for them in the cases of projective, conformal and
Grassmannian structures.
