Kolomna’s kremlin and old trading quarter are walkable. Dmitrov offers a compact route from the station to the earthworks and Kropotkin’s house. Allow extra time in Kolomna for museums and the return from the pier.
In Zvenigorod, take local transport from the station to the Manege, then walk the centre and make a separate hop to the monastery. Serpukhov’s art museum and Church of the Intercession share a street, so you can book two visits and fit lunch between them.
For estates and monastery architecture
Abramtsevo and Sergiev Posad combine well by car. By train, give either destination its own day: the journey and the walk or ride from the station will take part of the morning.