The Taman Sari Water Castle is located near the Royal Palace, which we didn't get to visit because it was already closed when we got there, within the Kraton. After buying our entrance tickets, we were greeted by one of the tour guides lined up to meet visitors at the entrance. Our assigned tour guide promptly started the tour of the castle grounds.
We really had not idea of the history of the water castle prior to our visit. So, it was interesting to learn that it used to house Sultan's concubines/mistresses and family and he spends his time there when he is not busy with boring task of actually ruling a sultanate.