when you have more Time and a car which can go bad roads, i would propose you visit the ruins on the Dereboynu peninsula. There is at least, The church of st. Thomas high above the lake, a bit further on another church ruin with a wonderful graveyard just beneath te lake. near the beginning is Kamrak vank, hidden in the first valley, and there is said to be another Church at the top of the peninsula
other Sites i would recommend: Surp bartholomaeus (albayrak) and soradir (yanal). you have to get the permission from baskale, but the soldiers were very friendly to me.