Hi Suzanne
Welcome to the forum :) We would be happy to help you make a plan to visit the Aran Islands from Doolin. I will assume you are not familiar with the islands and give you a bit of background information, so bear with me if I am telling you things you already know!
There are 3 islands - Inis Mor, Inis Meain and Inis Oirr. From Doolin, you can visit any of the islands, the closest is Inis Oirr (15 minutes sailing on the new Star of Doolin) and the farthest away is Inis Mor (approx 1 hour 20 minutes each way. I have more information in a
post here on why you can't get to all 3 islands in 1 day (basically they are too far apart) and a bit more detail on each island in this
post.
We recently took a special Irish visitor to Inis Oirr and Inis Mor - Ryan Tubridy, who is an Irish broadcasting celebrity. You might enjoy the little video we put together of his trip with us -
You can also combine the island day trip with a return sailing below the Cliffs of Moher, where you can see these amazing iconic cliffs from sea level, looking up at all the tiny people at the top!
The sailing times and trip options are available
here, but let me know if you have any further questions, I'd be happy to help. Enjoy planning your adventure :)
All the best, Joan