Dia Duit Linda,

If you take the coast road to Doollin, you will drive past the Cliffs of Moher, so stopping enroute to Doolin is ideal to prevent backtracking.

A trip to the Aran Islands is a full day in and of itself. You would catch the Ferry out of Doolin, disembark at Kilronan on Inis Mor and then spend the day, or the better part of one, exploring the island itself. You have three choices for exploring Inis mor: Pony & Trap, Bicycle or tour van. I would recommend the Pony & Trap.

Unfortunately, something will have to be cut. I think jet lag will weigh in on your first day, as well. It is such a temptation, Ireland, there is so much to see and do. It really is a struggle not to give into temptation and try to fill every minute and hour. Its like being dropped off in the most awesome of chocolate shops with only two dollars to spend! However, if you don't leave open gaps, you will miss the spontaneous moments that fill you with the magic of Ireland.

Slan Beo,

Bit

Lough Derg is more about its several lakeside communities with spots for nice views and stops at shops (may owned by local craftspeople). It's real strength is in being able to enjoy the leisurely and scenic drive with stops in towns, pubs, shops and restaurants. To try and "squeeze it in" will leave you disappointed. I love Lough Derg, but I'd suggest saving for a trip when you have many of these other biggies checked off your list.

If you want a taste of Lough Derg, you could stop by Killaloe/Ballina and drive up to Tuamgraney and then cut across to Clare's western destinations. It's only a sliver, but it's pleasant. Here's a photo of a lookout above Ballina that I really enjoy: