I wrote about this in our special 4-volume Atlantis on the Romanovs in the Crimea. The most relevant bits below:
Midway up the slope of Mount Moghabi, Alexander II had a third house built as a gift to his wife. Called Eriklik, this was a simple, one storey villa, designed by architect A. I. Rezanov, and set amidst the pine-clad cliffs. The villa backed up against the hill, but the other three sides were wrapped with terraces and covered balconies, where the Empress could relax in the shade and enjoy the magnificent, panoramic views over the entire Livadia estate and the Black Sea. Although the situation was exquisite, the Empress found the long, rough carriage ride up the winding mountain roads an ordeal, and is said to have spent only fifteen days here. Later, a small farm was built in a nearby meadow, and the estate became a favorite destination, for picnics by the adults, and excursions to the farm for the children of Nicholas II, who spent hours playing with the sheep, Shetland ponies, and goats their father kept here.
I think there were quite a few visits by Olga and Tatiana described as well, but I can't lay my hands on the information at the moment.
Hope this helps,