Hello,
Am from Donegal but don't know that area. Try searching on boards.ie donegal page and you will get a better answer.
I plan to visit Tory Island some time myself. There are many beautiful places to visit in Donegal including:
Beltany Stone circle - Raphoe, Grianan Ailigh - near burt, walled city of Derry, Malin head - most northern point of Ireland, Dunree fort, mamore gap.
Ulster American Folk park - near Omagh Giants Cause way, Dunluce Castle, Rope bridge, Bushmlls Distillery, Bishops castle (not sure about this name) - all in Co. Antrim
Donegal Castle - Donegal town, Sliabh liag, Narin & Portnoo (there is a very large portal Dolmen near here but I'm not sure where it is and a castle on an island too.
Glenveagh castle, Portsalon, ards forest park
Just finishing taking an American relative around all these areas.
Later,
WM