Try this:
Sunday - Drive to Ballyliffin, Warm up on the Pollan 9, Stay in Ballyliffin for 2 Nights
Monday - Ballyliffin Old and/or Glashedy, Visit Malin Head
Tuesday - Take ferry across Lough Swilly to Portsalon (maybe Otway), Stay in Downings/Carrigart for 3 Nights
Wednesday - Sandy Hills AM, Old Tom Morris PM
Thursday - St. Patrick's
Friday - Cruit Island AM, Narin & Portnoo PM, Stay in Donegal Town for 1 Night (Great restaurants & pubs)
Saturday - Parkland options on way back to Dublin (Lough Erne Faldo, Slieve Russell, Headfort or Killeen Castle)